Table 1 Combination of currently available heterologous vaccines.

From: Challenges and developments in universal vaccine design against SARS-CoV-2 variants

Vaccine type

Vaccines (prime plus boost)

Manufacturer

Efficacy against variants (compared with homologous boosting)

References

Adenovirus vectored vaccine plus mRNA vaccine

ChAdOx1 nCoV-19 plus BNT162b2

AstraZeneca-Oxford/ Pfizer-BioNTech

Significantly higher nAb titers against Alpha, Beta and Gamma variants 17 days after booster shot

71

Ad26.COV2.S plus BNT162b2 or mRNA-1273

Johnson & Johnson-Janssen/ Pfizer-BioNTech/ Moderna

2 times higher efficacy against symptomatic infection by Omicron 14 days to 1 month since last dose

70

BNT162b2 plus Ad26.COV2.S

Pfizer-BioNTech/ Johnson & Johnson-Janssen

More durable humoral and cellular responses at least 16 weeks after boosting vaccination

72

Inactivated vaccine plus adenovirus vectored vaccine

CoronaVac plus Ad5-nCoV

Sinovac/ CanSino

6.8-fold higher levels of nAb titers against Delta variant 14 days after boosting

NCT0489245973

CoronaVac plus aerosolised Ad5-nCoV

18.1–24 or 7.88 times higher nAb titers against Delta or Omicron variant as well as elicited IgA and resident memory B and T cells 28 days after booster dose

NCT0504325974,78

Inactivated vaccine plus recombinant protein subunit vaccine

CoronaVac or BBIBP-CorV plus ZF2001

Sinovac/ Sinopharm/ Zhifei Longcom

Induced at least 70-fold increase in neutralizing levels against Alpha, Beta, Gamma and Delta pseudoviruses 2 weeks after booster vaccination

75

Inactivated vaccine plus mRNA vaccine

CoronaVac plus BNT162b2

Sinovac/ Pfizer-BioNTech

6.3-fold increased nAb titers against Delta variant and 1.4-fold against Omicron 28 days after booster shot

76

CoronaVac or BBIBP plus AWcorna

Sinovac/ Sinopharm/ Walvax

Higher neutralization antibodies against Delta and Omicron variants (6.5-times and 4.4-times, respectively) 28 days after booster

NCT0484710277