Cryptogram system of virus nomenclature was given by –

Correct option is A

Correct option (a) Gibbs and Harrison, 1968
· Introduced the cryptogram system for virus classification.
· Used symbols to describe virus properties (genome, vector, host).
Other options:
· (b) Smith, 1937 – Early virus studies.
· (c) Holmes, 1936 – Binomial nomenclature for viruses.
· (d) Johnson, 1927 – Virus disease descriptions.