Experimental: Group 1a Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 |
Biological: ChAdOx1 nCoV-19 A single dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Active Comparator: Group 1b Volunteers will receive a standard single dose of MenACWY vaccine |
Biological: MenACWY Standard single dose of MenACWY vaccine delivered intramuscularly |
Experimental: Group 1c Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and a boost dose of 5x10^10vp ChAdOx1 nCoV-19 9 months later |
Biological: ChAdOx1 nCoV-19 A single dose of 5x10^10vp of ChAdOx1 nCoV-19 Biological: ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) late vaccine (LV)A dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) 9 months after receiving a single or double dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Experimental: Group 1d Volunteers will receive a standard single dose of MenACWY vaccine. 9 moths later they will receive two doses of 5x10^10vp ChAdOx1 nCoV-19 4-12 weeks apart |
Biological: MenACWY Standard single dose of MenACWY vaccine delivered intramuscularly Biological: ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) late vaccine two (LVT)A dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) 9 months after receiving a single or double dose of MenACWY, then a boost 4-12 weeks later |
Experimental: Group 2a Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 |
Biological: ChAdOx1 nCoV-19 A single dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Active Comparator: Group 2b Volunteers will receive a standard single dose of MenACWY vaccine |
Biological: MenACWY Standard single dose of MenACWY vaccine delivered intramuscularly |
Experimental: Group 2c Volunteers will receive two doses of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and week 8 |
Biological: ChAdOx1 nCoV-19 full boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Experimental: Group 2d Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and a boost dose of 2.5x10^10vp ChAdOx1 nCoV-19 at week 8 |
Biological: ChAdOx1 nCoV-19 half boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of 2.5x10^10vp of ChAdOx1 nCoV-19 |
Active Comparator: Group 2e Volunteers will receive two standard single doses of MenACWY vaccine at week 0 and week 8 |
Biological: MenACWY boost A standard dose of MenACWY followed by a boost dose of MenACWY |
Experimental: Group 2f Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and a boost dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) a minimum of 4 weeks later |
Biological: ChAdOx1 nCoV-19 0.5mL boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) |
Active Comparator: Group 2g Volunteers will receive two standard single doses of MenACWY vaccine a minimum of 4 weeks apart |
Biological: MenACWY boost A standard dose of MenACWY followed by a boost dose of MenACWY |
Experimental: Group 3a Volunteers will receive one dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and one dose of 5x10^10vp ChAdOx1 nCoV-19 at week 4 |
Biological: ChAdOx1 nCoV-19 full boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Experimental: Group 3b Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0, a boost dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) a minimum of 4 weeks later, and a third dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) at 9 months |
Biological: ChAdOx1 nCoV-19 full boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of 5x10^10vp of ChAdOx1 nCoV-19 Biological: ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) late vaccine (LV)A dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) 9 months after receiving a single or double dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Experimental: Group 4a Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 |
Biological: ChAdOx1 nCoV-19 A single dose of 5x10^10vp of ChAdOx1 nCoV-19 Drug: Paracetamol1g every 6 hours for 24 hours |
Active Comparator: Group 4b Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 delivered intramuscularly |
Biological: MenACWY Standard single dose of MenACWY vaccine delivered intramuscularly Drug: Paracetamol1g every 6 hours for 24 hours |
Experimental: Group 4c Volunteers will receive a single dose of 5x10^10vp ChAdOx1 nCoV-19 at week 0 and a boost dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) a minimum of 4 weeks later |
Biological: ChAdOx1 nCoV-19 A single dose of 5x10^10vp of ChAdOx1 nCoV-19 Biological: ChAdOx1 nCoV-19 0.5mL boostA single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) |
Active Comparator: Group 4d Volunteers will receive two standard single doses of MenACWY vaccine a minimum of 4 weeks apart |
Biological: MenACWY boost A standard dose of MenACWY followed by a boost dose of MenACWY |
Experimental: Group 5a Volunteers will receive two doses of 5x10^10vp ChAdOx1 nCoV-19 ≤ 16 weeks apart, and a third dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) at 9 months |
Biological: ChAdOx1 nCoV-19 full boost A single dose of 5x10^10vp of ChAdOx1 nCoV-19 followed by a boost dose of 5x10^10vp of ChAdOx1 nCoV-19 Biological: ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) late vaccine (LV)A dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) 9 months after receiving a single or double dose of 5x10^10vp of ChAdOx1 nCoV-19 |
Experimental: Group 5b Volunteers will receive two standard single doses of MenACWY vaccine ≤ 16 weeks apart, a dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) at 9 months then a second dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x1010vp) 4-12 weeks later |
Biological: MenACWY boost A standard dose of MenACWY followed by a boost dose of MenACWY Biological: ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) late vaccine two (LVT)A dose of ChAdOx1 nCoV-19 0.5mL (3.5-6.5x10^10vp) 9 months after receiving a single or double dose of MenACWY, then a boost 4-12 weeks later |