Development of safe and protective vaccines against infectious pathogens remains a challenge. Inactivation
of rabies virus is a critical step in the production of vaccines and other research reagents.
Beta-propiolactone (PL); the currently used inactivating agent for rabies virus is expensive and proved
to be carcinogenic in animals. This study aimed to investigate the ability of hydrogen peroxide (H2O2)
to irreversibly inactivate rabies virus without affecting its antigenicity and immunogenicity in pursuit of
finding safe, effective and inexpensive alternative inactivating agents. H2O2 3% rapidly inactivated a Vero
cell adapted fixed rabies virus strain designated as FRV/K within 2 h of exposure without affecting its antigenicity
or immunogenicity. No residual infectious virus was detected and the H2O2-inactivated vaccine
proved to be safe and effective when compared with the same virus harvest inactivated with the classical
inactivating agent PL. Mice immunized with H2O2-inactivated rabies virus produced sufficient level of
antibodies and were protected when challenged with lethal CVS virus. These findings reinforce the idea
that H2O2 can replace PL as inactivating agent for rabies virus to reduce time and cost of inactivation
process.
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