key inclusion criteria: * adult males and females, 18 to 60 years of age (inclusive) * body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening * must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 12 months prior to day 1 (i.h. booster arms and i.n or i.h. multiple dose booster arms only) key

key inclusion criteria: * adult males and females, 18 to 60 years of age (inclusive) * body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening * must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 12 months prior to day 1 (i.h. booster arms and i.n or i.h. multiple dose booster arms only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 12 months prior to day 1 (i.h. booster arms and i.n or i.h. multiple dose booster arms only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 12 months prior to day 1 (i.h. booster arms and i.n or i.h. multiple dose booster arms only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 6 months prior to day 1 (i.h. booster arms only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only), not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) and not less than 6 months prior to day 1 (i.h. booster arms only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only) and not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) key

key inclusion criteria: adult males and females, 18 to 60 years of age (inclusive) body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening must have been fully vaccinated against covid-19 and received last dose not less than 3 months prior to day 1 (high dose #3 i.m. and i.n. booster arms only) and not less than 5 months prior to day 1 (high dose #4 i.n. booster arm only) key

key inclusion criteria: - adult males and females, 18 to 60 years of age (inclusive) - body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening key

key inclusion criteria: - adult males and females, 18 to 60 years of age (inclusive) - body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening key

key inclusion criteria: - adult males and females, 18 to 55 years of age (inclusive) - body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening key

key inclusion criteria: - adult males and females, 18 to 55 years of age (inclusive) - body mass index ≥ 18.0 and ≤ 32.0 kg/m2, with a body weight ≥ 50 kg at screening key