Challenges and prospects of COVID-19 vaccine development based on the
progress made in SARS and MERS vaccine development
Abstract
The outbreak of COVID-19 as a pandemic has shaken the global health
system and economy by their roots. This epidemic is still spreading and
showing no signs of decreasing trend. Vaccination is the only effective
and economical means to control this pandemic. A number of research
institutions and pharmaceutical companies have plunged into the race of
vaccine development against COVID-19 which are in various stages of
development. An intriguing fact of coronavirus infections is that in
every decade of 21st century there is a new major coronavirus epidemic
viz. SARS in 2002, MERS in 2012, and now COVID-19; and such epidemics
are expected in future too. Since, maximum biological characteristics of
SARS-CoV-2 are still obscure the scientists are relying on the
information available on SARS-CoV and to some extent on MERS-CoV for
designing and development of COVID-19 vaccines. But there is a need of
vigorous testing for immunogenicity, safety, efficacy, and level of
protection conferred in the hosts. This review focuses on the challenges
and prospects of vaccine development against COVID-19. It highlights
seriousness, bottlenecks in vaccine development, possible vaccine
candidates, different vaccine strategies, safety evaluation issues, and
vaccine production process pertaining to COVID-19 based on the knowledge
acquired on SARS and MERS vaccine development in the past.