| Pharmacotherapeutic group: Influenza vaccines, ATC Code J07BB02. Pharmacodynamic effects Immune response to Pandemrix (H1N1)v Adults aged 18-60 years Two clinical studies evaluated the immunogenicity of Pandemrix in healthy subjects aged 18-60 years. All subjects received two doses of 0.5 ml 21 days apart, except in study D-Pan H1N1-008, in which half of the subjects received only one dose of 0.5 ml. The anti-HA antibody responses were as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | | D-Pan H1N1-007
| D-Pan H1N1-008
| | 21 days after 1st
dose
| 21 days after 2nd
dose
| 21 days after 1st
dose
| 21 days after 2nd
dose
| | Total enrolled subjects
N=60
[95% CI]
| Seronegative subjects
prior to vaccination
N=37
[95% CI]
| Total enrolled subjects
N=59
[95% CI]
| Seronegative subjects
prior to vaccination
N=37
[95% CI]
| Total enrolled subjects
N=120
[95% CI]
| Seronegative subjects
prior to vaccination
N=76
[95% CI]
| Total enrolled subjects
N=66
[95% CI]
| Seronegative subjects
prior to vaccination
N=42
[95% CI]
| | Seroprotection rate1 | 100%
[94.0; 100]
| 100%
[90.5;100]
| 100%
[93.9; 100]
| 100%
[90.5;100]
| 97.5%
[92.9; 99.5]
| 96.1%
[88.9;99.2]
| 100%
[94.6; 100]
| 100%
[91.6;100]
| | Seroconversion rate2 | 98.3%
[91.1; 100]
| 100%
[90.5; 100]
| 98.3%
[90.9; 100]
| 100%
[90.5;100]
| 95.0%
[89.4; 98.1]
| 96.1%
[88.9;99.2]
| 98.5%
[91.8; 100]
| 100%
[91.6;100]
| | Seroconversion factor3 | 38.1
| 47.0
| 72.9
| 113.3
| 42.15
[33.43; 53.16]
| 50.73
[37.84; 68.02]
| 69.7
[53.79; 90.32]
| 105.9
[81.81;137.08]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.Six months after the first dose, the seroprotection rate was as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | D-Pan H1N1-007
| D-Pan H1N1-008
| | Month 6 after 2 doses of 0.5 ml
| Month 6 after 2 doses of 0.5 ml
| Month 6 after 1 dose of 0.5 ml
| | | Total enrolled subjects
N=59
[95% CI]
| Seronegative subjects prior to vaccination
N=35
[95% CI]
| Total enrolled subjects
N=67
[95% CI]
| Seronegative subjects prior to vaccination
N=43
[95% CI]
| Total enrolled subjects
N=51
[95% CI]
| Seronegative subjects prior to vaccination
N=32
[95% CI]
| | Seroprotection rate1 | 100%
[93.9;100]
| 100%
[90.0;100]
| 97.0%
[89.6;99.6]
| 95.3%
[84.2;99.4]
| 86.3%
[73.7;94.3]
| 78.1%
[60.0;90.7]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40Twelve months after the first dose, the seroprotection rate was as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | D-Pan H1N1-007
| D-Pan H1N1-008
| | Month 12 after 2 doses of 0.5 ml
| Month 12 after 2 doses of 0.5 ml
| Month 12 after 1 dose of 0.5 ml
| | | Total enrolled subjects
N=59
[95% CI]
| Seronegative subjects prior to vaccination
N=36
[95% CI]
| Total enrolled subjects
N=67
[95% CI]
| Seronegative subjects prior to vaccination
N=43
[95% CI]
| Total enrolled subjects
N=52
[95% CI]
| Seronegative subjects prior to vaccination
N=32
[95% CI]
| | Seroprotection rate1 | 78.0%
[65.3;87.7]
| 66.7%
[49.8;80.9]
| 79.1%
[67.4;88.1]
| 69.8%
[53.9;82.8]
| 65.4%
[50.9;78.0]
| 53.1%
[34.7;70.9]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40In study D-Pan-H1N1-008, the neutralising antibody responses were as follows:| Serum neutralising antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | After 2 doses of 0.5 ml
| After 1 dose of 0.5 ml
| | | Day 21
N=22
| Day 42
N=22
| Month 6
N=22
| Day 21
N=17
| Day 42
N=17
| Month 6
N=17
| | Vaccine Response Rate2 | 68.2%
[45.1;86.1]
| 90.9%
[70.8;98.9]
| 81.8%
[59.7;94.8]
| 70.6%
[44.0;89.7]
| 64.7%
[38.3;85.8]
| 35.3%
[14.2;61.7]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titreElderly (>60 years) The anti-HA antibody responses in healthy subjects aged >60 years who received either one or two doses of 0.5 ml 21 days apart were as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 61-70 years
| 71-80 years
| | 21 days after 1st
dose
| 21 days after 2nd
dose
| 21 days after 1st
dose
| 21 days after 2nd
dose
| | Total enrolled subjects
N=75
[95% CI]
| Seronegative subjects prior to vaccination
N=43
[95% CI]
| Total enrolled subjects
N=40
[95% CI]
| Seronegative subjects prior to vaccination
N=23
[95% CI]
| Total enrolled subjects
N=40
[95% CI]
| Seronegative subjects prior to vaccination
N=23
[95% CI]
| Total enrolled subjects
N=24
[95% CI]
| Seronegative subjects prior to vaccination
N=15
[95% CI]
| | Seroprotection rate1 | 88.0% [78.4; 94.4]
| 81.4%
[66.6;91.6]
| 97.5%
[86.8; 99.9]
| 95.7%
[78.1;99.9]
| 87.5%
[73.2; 95.8]
| 82.6%
[61.2;95.0]
| 100%
[85.8; 100]
| 100%
[78.2;100]
| | Seroconversion rate2 | 80.0% [69.2; 88.4]
| 81.4%
[66.6;91.6]
| 95.0%
[83.1; 99.4]
| 95.7%
[78.1;99.9]
| 77.5%
[61.5; 89.2]
| 82.6%
[61.2;95.0]
| 91.7%
[73.0; 99.0]
| 100%
[78.2;100]
| | Seroconversion factor3 | 13.5 [10.3; 17.7]
| 20.3
[13.94; 28.78]
| 37.45
[25.29; 55.46]
| 62.06
[42.62; 90.37]
| 13.5
[8.6; 21.1]
| 20.67
[11.58; 36.88]
| 28.95
[17.02; 49.23]
| 50.82
[32.97; 78.35]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | >80 years
| | 21 days after 1st
dose
| 21 days after 2nd
dose
| | Total enrolled subjects
N=5
[95% CI]
| Seronegative subjects prior to vaccination
N=3
[95% CI]
| Total enrolled subjects
N=3
[95% CI]
| Seronegative subjects prior to vaccination
N=1
[95% CI]
| | Seroprotection rate1 | 80.0%
[28.4;99.5]
| 66.7%
[9.4;99.2]
| 100%
[29.2;100]
| 100%
[2.5;100]
| | Seroconversion rate2 | 80.0%
[28.4;99.5]
| 66.7%
[9.4;99.2]
| 100%
[29.2;100]
| 100%
[2.5;100]
| | Seroconversion factor3 | 18.4
[4.3;78.1]
| 17.95
[0.55;582.25]
| 25.49
[0.99;654.60]
| 64.0
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.Six months after the first dose, the seroprotection rate was as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 61-70 years
| 71-80 years
| | Month 6 after 2 doses of 0.5 ml
| Month 6 after 1 dose of 0.5 ml
| Month 6 after 2 doses of 0.5 ml
| Month 6 after 1 dose of 0.5 ml
| | | Total enrolled subjects
N=41
[95% CI]
| Seronegative subjects prior to vaccination
N=23
[95% CI]
| Total enrolled subjects
N=33
[95% CI]
| Seronegative subjects prior to vaccination
N=19
[95% CI]
| Total enrolled subjects
N=24
[95% CI]
| Seronegative subjects prior to vaccination
N=15
[95% CI]
| Total enrolled subjects
N=15
[95% CI]
| Seronegative subjects prior to vaccina-tion
N=7
[95% CI]
| | Seroprotection rate1 | 92.7%
[80.1; 98.5]
| 91.3%
[72.0; 98.9]
| 51.5%
[33.5; 69.2]
| 31.6%
[12.6; 56.6]
| 83.3%
[62.6; 95.3]
| 73.3%
[44.9; 92.2]
| 66.7%
[38.4; 88.2]
| 28.6%
[3.7; 71.0]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | >80 years
| | Month 6 after 2 doses of 0.5 ml
| Month 6 after 1 dose of 0.5 ml
| | Total enrolled subjects
N=3
[95% CI]
| Seronegative subjects prior to vaccination
N=1
[95% CI]
| Total enrolled subjects2N=2
[95% CI]
| | Seroprotection rate1 | 100%
[29.2;100]
| 100%
[2.5;100]
| 50.0%
[1.3;98.7]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:402all subjects seronegative prior to vaccinationTwelve months after the first dose, the seroprotection rate was as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 61-70 years
| 71-80 years
| | Month 12 after 2 doses of 0.5 ml
| Month 12 after 1 dose of 0.5 ml
| Month 12 after 2 doses of 0.5 ml
| Month 12 after 1 dose of 0.5 ml
| | | Total enrolled subjects
N=40
[95% CI]
| Seronegative subjects prior to vaccination
N=23
[95% CI]
| Total enrolled subjects
N=33
[95% CI]
| Seronegative subjects prior to vaccination
N=19
[95% CI]
| Total enrolled subjects
N=25
[95% CI]
| Seronegative subjects prior to vaccination
N=16
[95% CI]
| Total enrolled subjects
N=15
[95% CI]
| Seronegative subjects prior to vaccina-tion
N=7
[95% CI]
| | Seroprotection rate1 | 55.0%
[38.5;70.7]
| 34.8%
[16.4;57.3]
| 39.4%
[22.9;57.9]
| 21.1%
[6.1;45.6]
| 48.0%
[27.8;68.7]
| 25.0%
[7.3;52.4]
| 53.3%
[26.6;78.7]
| 14.3%
[0.4;57.9]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | | >80 years
| | | Month 12 after 2 doses of 0.5 ml
| Month 12 after 1 dose of 0.5 ml
| | | Total enrolled subjects
N=3
[95% CI]
| Seronegative subjects prior to vaccination
N=1
[95% CI]
| Total enrolled subjects2N=2
[95% CI]
| | Seroprotection rate1 | 100%
[29.2;100]
| 100%
[2.5;100]
| 50.0%
[1.3;98.7]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:402all subjects seronegative prior to vaccinationThe neutralising antibody responses in subjects >60 years were as follows:| Serum neutralising antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | After 2 doses of 0.5 ml
| After 1 dose of 0.5 ml
| | | Day 21
N=22
| Day 42
N=22
| Month 6
N=22
| Day 21
N=18
| Day 42
N=18
| Month 6
N=18
| | Vaccine Response Rate2 | 68.2%
[45.1;86.1]
| 86.4%
[65.1;97.1]
| 63.6%
[40.7;82.8]
| 33.3%
[13.3;59.0]
| 27.8%
[9.7;53.5]
| 38.9%
[17.3;64.3]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titrePaediatric population Children aged 10-17 years Two clinical studies evaluated the administration of a half (0.25 ml) dose and a full (0.5 ml) adult dose of Pandemrix in healthy children 10 to 17 years of age. The anti-HA antibody responses 21 days after the first and the second dose were as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | Half dose
(D-Pan-H1N1-023)
| Full dose
(D-Pan-H1N1-010)
| | Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| | Post dose 1
N=54
| Post dose 2
N=54
| Post dose 1
N=37
| Post dose 2
N=37
| Post dose 1
N=92
| Post dose 2
N=88
| Post dose 1
N=59
| Post dose 2
N=57
| | Seroprotection rate1 | 98.1%
[90.1; 100]
| 100%
[93.4; 100]
| 97.3%
[85.8; 99.9]
| 100%
[90.5; 100]
| 100%
[96.1; 100]
| 100%
[95.9; 100]
| 100%
[93.9; 100]
| 100%
[93.7; 100]
| | Seroconversion rate2 | 96.3%
[87.3; 99.5]
| 98.1%
[90.1; 100]
| 97.3%
[85.8; 99.9]
| 100%
[90.5; 100]
| 96.7%
[90.8; 99.3]
| 96.6%
[90.4; 99.3]
| 100%
[93.9; 100]
| 100%
[93.7; 100]
| | Seroconversion factor3 | 48.29
[35.64; 65.42]
| 107.74
[76.64; 151.45]
| 67.7
[49.21; 93.05
| 187.92
[150.67; 234.38]
| 72.2
[57.2; 91.2]
| 139.1
[105.7; 183.1]
| 99.4
[81.0; 122.1]
| 249.8
[212.9; 293.2]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4according to protocolThe Day 180 seroprotection rate in the children who had received two half (0.25 ml) doses was 100%.Twelve months after the first dose, the seroprotection rates in the children who had received two half (0.25 ml) doses were 90.2% and 100% in those who had received two full (0.5 ml) adult doses.The neutralising antibody responses were as follows:| Serum neutralising antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | Half dose
| Full dose
| | | Post dose 1
N=13
| Post dose 2
N=14
| Month 6
N=13
| Post dose 1
N=30
| Post dose 2
N=29
| Month 12
N=28
| | Vaccine Response Rate2 | 69.2%
[38.6;90.9]
| 100%
[76.8;100]
| 92.3%
[64.0;99.8]
| 86.7%
[69.3;96.2]
| 100%
[88.1;100]
| 89.3%
[71.8;97.7]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titreChildren aged 3 to 9 years In two clinical studies in which children aged 3 to 9 years old received two 0.25 ml doses (half adult dose) or two 0.5 ml doses (adult dose) of Pandemrix, the anti-HA antibody responses 21 days after the first and the second dose were as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 3-5 years
| | Half adult dose
(D-Pan-H1N1-023)
| Adult dose5(D-Pan-H1N1-010)
| | Total subjects4N=28
[95% CI]
| Seronegative subjects prior to vaccination
N=26
[95% CI]
| Total subjects4N=51
[95% CI]
| | Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| | Seroprotection rate1 | 100%
[87.7;100]
| 100%
[87.7;100]
| 100%
[86.8;100]
| 100%
[86.8;100]
| 100%
[93.0;100]
| 100%
[93.0;100]
| | Seroconversion rate2 | 100%
[87.7;100]
| 100%
[87.7;100]
| 100%
[86.8;100]
| 100%
[86.8;100]
| 100%
[93.0;100]
| 100%
[93.0;100]
| | Seroconversion factor3 | 33.62
[26.25;43.05]
| 237.68
[175.28;322.29]
| 36.55
[29.01;46.06]
| 277.31
[223.81; 343.59]
| 49.1
[41.9;57.6]
| 384.9
[336.4;440.3]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4according to protocol5all subjects seronegative prior to vaccination| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 6-9 years
| | Half adult dose
(D-Pan-H1N1-023)
| Adult dose
(D-Pan-H1N1-010)
| | Total subjects4N=30
[95% CI]
| Seronegative subjects prior to vaccination
N=29
[95% CI]
| Total subjects4N=55
[95% CI]
| Seronegative subjects prior to vaccination
N=48
[95% CI]
| | Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| | Seroprotection rate1 | 100%
[88.4; 100]
| 100%
[88.4; 100]
| 100%
[88.1; 100]
| 100%
[88.1; 100]
| 100%
[93.5; 100]
| 100%
[93.5; 100]
| 100%
[92.6; 100]
| 100%
[92.6; 100]
| | Seroconversion rate2 | 100%
[88.4; 100]
| 100%
[88.4; 100]
| 100%
[88.1; 100]
| 100%
[88.1; 100]
| 100%
[93.5; 100]
| 100%
[93.5; 100]
| 100%
[92.6; 100
| 100%
[92.6; 100
| | Seroconversion factor3 | 36.33
[27.96; 47.22]
| 185.25
[142.09; 241.52]
| 37.7
[28.68; 48.71]
| 196.81
[154.32; 251.00]
| 59.0
[48.3; 72.0]
| 225.7
[182.7; 278.2]
| 61.7
[49.9; 76.3]
| 283.2
[246.0; 326.0]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4according to protocolThe Day 180 seroprotection rate in the children who had received two half (0.25 ml) doses was 100% in both age groups. Twelve months after the first dose, the seroprotection rate was 85% in both age groups. In the children who had received two adult (0.5 ml) doses, the seroprotection rates twelve months after the first dose were 100% for children aged 3-5 years and 98.0% for those aged 6-9 years.The neutralising antibody responses were as follows:| Serum neutrali-sing antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | 3-5 years
| | | Half adult dose
| Adult dose
| | | Post dose 1
N=16
| Post dose 2
N=15
| Month 6
N=16
| Post dose 1
N=32
| Post dose 2
N=29
| Month 12
N=24
| | Vaccine Response Rate2 | 50.0%
[24.7; 75.3]
| 100%
[78.2; 100]
| 100%
[79.4; 100]
| 81.3%
[63.6; 92.8]
| 100%
[88.1; 100]
| 100%
[85.8; 100]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titre| Serum neutralising antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | 6-9 years
| | | Half adult dose
| Adult dose
| | | Post dose 1
N=14
| Post dose 2
N=15
| Month 6
N=15
| Post dose 1
N=37
| Post dose 2
N=37
| Month 12
N=31
| | Vaccine Response Rate2 | 71.4%
[41.9; 91.6]
| 100%
[78.2; 100]
| 93.3%
[68.1; 99.8]
| 86.7%
[69.3; 96.2]
| 100%
[88.1; 100]
| 96.8%
[83.3; 99.1]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titreChildren aged 6-35 months In a clinical study (D-Pan-H1N1-009) in healthy children 6 months to 35 months of age (stratified in ranges from 6 to 11, 12 to 23 and 24-35 months of age) the anti-HA antibody responses 21 days after a first and a second half adult dose (i.e. 0.25 ml) or adult dose (i.e. 0.5 ml) of Pandemrix were as follows:| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 6-11 months
| | Half adult dose
| Adult dose
| | Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| | Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| | N=34
| N = 32
| N=30
| N=28
| N=15
| N=15
| N=14
| N=14
| | Seroprotection rate1 | 100%
[89.7; 100]
| 100%
[89.1; 100]
| 100%
[88.4; 100]
| 100%
[87.7; 100]
| 100%
[78.2; 100]
| 100%
[78.2; 100]
| 100%
[76.8; 100]
| 100%
[76.8; 100]
| | Seroconversion rate2 | 97.1%
[84.7; 99.9]
| 100%
[89.1; 100]
| 100
[88.4; 100]
| 100%
[87.7; 100]
| 100%
[78.2; 100]
| 100%
[78.2; 100]
| 100%
[76.8; 100]
| 100%
[76.8; 100]
| | Seroconversion factor3 | 48.12
[34.34; 67.42]
| 276.14
[164.23; 455.99]
| 64.0
[52.3; 78.3]
| 441.3
[365.7; 532.6]
| 46.29
[38.83; 59.80]
| 370;48
[217,97; 629,69]
| 49.9
[40.3; 61.9]
| 452.4
[322.4; 634.6]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4according to protocol| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 12-23 months
| | Half adult dose
| Adult dose
| | Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| Total subjects4 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| | Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| | N=34
| N= 32
| N=33
| N=31
| N=16
| N=17
| N=15
| N=16
| | Seroprotection rate1 | 100%
[89.7; 100]
| 100%
[89.1; 100]
| 100%
[89.4; 100]
| 100%
[88.8; 100]
| 100%
[79.4; 100]
| 100%
[80.5; 100]
| 100%
[78.2; 100]
| 100%
[79.4; 100]
| | Seroconversion rate2 | 100%
[89.7; 100]
| 100%
[89.1; 100]
| 100%
[89.4; 100]
| 100%
[88.8; 100]
| 100%
[79.4; 100]
| 100%
[80.5; 100]
| 100%
[78.2; 100]
| 100%
[79.4; 100]
| | Seroconversion factor3 | 63.37
[48.13; 83.43]
| 386.45
[308.54; 484.02]
| 66.7
[51.4; 86.7]
| 404.8
[327.8; 500.0]
| 64.06
[38.55; 106.44]
| 472.16
[343.74; 648.57]
| 75.3
[50.3; 112.5]
| 523.2
[408.5; 670.1]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4according to protocol| anti-HA antibody
| Immune response to A/California/7/2009 (H1N1)v-like
| | 24-35 months
| | Half adult dose4 | Adult dose
| | Total subjects5 [95% CI]
| Total subjects5 [95% CI]
| Seronegative subjects prior to vaccination
[95% CI]
| | Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| Post dose 1
| Post dose 2
| | N=33
| N= 33
| N=16
| N=16
| N=12
| N=12
| | Seroprotection rate1 | 100%
[89.4; 100]
| 100%
[89.4; 100]
| 100%
[79.4;100]
| 100%
[79.4;100]
| 100%
[73.5;100]
| 100%
[73.5;100]
| | Seroconversion rate2 | 100%
[89.4; 100]
| 100%
[89.4; 100]
| 93.8
[69.8;99.8]
| 100%
[79.4;100]
| 100%
[73.5;100]
| 100%
[73.5;100]
| | Seroconversion factor3 | 52.97
[42.08;66.68]
| 389.64
[324.25;
468.21]
| 33.44
[18.59;60.16]
| 189.16
[83.80;
427.01]
| 55.4
[39.8;77.2]
| 406.4
[296.2;557.4]
| 1 seroprotection rate: proportion of subjects with haemagglutination inhibition (HI) titre ≥1:40; 2seroconversion rate: proportion of subjects who were either seronegative at pre-vaccination and have a protective post-vaccination titre of ≥1:40, or who were seropositive at pre-vaccination and have a 4-fold increase in titre; 3seroconversion factor: ratio of the post-vaccination geometric mean titre (GMT) and the pre-vaccination GMT.4all subjects seronegative prior to vaccination5according to protocolTwelve months after the first dose, the seroprotection rate was 100% in all age groups and dosage groups.The clinical relevance of the haemagglutination inhibition (HI) titre ≥1:40 in children is unknown.The neutralising antibody responses were as follows:| Serum neutrali-sing antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | 6-11 months
| | | Half dose
| Adult dose
| | | Post dose 1
N=28
| Post dose 2
N=28
| Month 12
N=22
| Post dose 1
N=14
| Post dose 2
N=14
| Month 12
N=10
| | Vaccine Response Rate2 | 57.1%
[37.2;
75.5]
| 96.4%
[81.7;
99.9]
| 86.4%
[65.1;
97.1]
| 57.1%
[28.9;
82.3]
| 100%
76.8;
100]
| 100%
[69.2;
100]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titre| Serum neutrali-sing antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | 12-23 months
| | | Half dose
| Adult dose
| | | Post dose 1
N=14
| Post dose 2
N=16
| Month 12
N=13
| Post dose 1
N=7
| Post dose 2
N=8
| Month 12
N=7
| | Vaccine Response Rate2 | 57.1%
[28.9;82.3]
| 100%
[79.4;100]
| 92.3%
[64.0;99.8]
| 71.4%
[29.0;96.3]
| 100%
[63.1;100]
| 100%
[59.0;100]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titre| Serum neutrali-sing antibody
| Immune response to A/Netherlands/602/9 (H1N1)v-like1 | | | 24-35 months
| | | Half dose
| Adult dose
| | | Post dose 1
N=17
| Post dose 2
N=17
| Month 12
N=14
| Post dose 1
N=8
| Post dose 2
N=7
| Month 12
N=5
| | Vaccine Response Rate2 | 58.8%
[32.9;81.6]
| 100%
[80.5;100]
| 100%
[76.8;100]
| 62.5%
[24.5;91.5]
| 100%
[59.0;100]
| 100%
[47.8;100]
| 1antigenically similar to A/California/7/2009 (H1N1)v-like2percentage of vaccinees who, if initially seronegative reach an antibody titre ≥32 1/DIL after vaccination or, if initially seropositive reach an antibody titre ≥ 4-fold the pre-vaccination antibody titreThe European Medicines Agency has deferred the obligation to submit the results of studies with Pandemrix in one or more subsets of the paediatric population in the prevention of influenza infection (see section 4.2 for information on paediatric use).Information from non-clinical studies: The ability to induce protection against homologous and heterologous vaccine strains was assessed non-clinically using ferret challenge models.In each experiment, four groups of six ferrets were immunized intramuscularly with an AS03 adjuvanted vaccine containing HA derived from H5N1/A/Vietnam/1194/04 (NIBRG-14). Doses of 15, 5, 1.7 or 0.6 micrograms of HA were tested in the homologous challenge experiment, and doses of 15, 7.5, 3.8 or 1.75 micrograms of HA were tested in the heterologous challenge experiment. Control groups included ferrets immunized with adjuvant alone, non-adjuvanted vaccine (15 micrograms HA) or phosphate buffered saline solution. Ferrets were vaccinated on days 0 and 21 and challenged by the intra-tracheal route on day 49 with a lethal dose of either H5N1/A/Vietnam/1194/04 or heterologous H5N1/A/Indonesia/5/05. Of the animals receiving adjuvanted vaccine, 87% and 96% were protected against the lethal homologous or heterologous challenge, respectively. Viral shedding into the upper respiratory tract was also reduced in vaccinated animals relative to controls, suggesting a reduced risk of viral transmission. In the unadjuvanted control group, as well as in the adjuvant control group, all animals died or had to be euthanized as they were moribund, three to four days after the start of challenge.Additional information is available from the studies conducted with a vaccine similar in composition to Pandemrix but containing antigen derived from H5N1 viruses. Please consult the Product Information of Pandemic influenza vaccine (H5N1) (split virion, inactivated, adjuvanted).
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