Question

In the early years of discovery, viruses were referred to as

• A. Pathogens
• B. Filterable agents
• C. Antigens
• D. None of the above

Answer 1

The correct option is B Filterable agents

In 1892, Dmitri Ivanowski showed that tobacco mosaic disease could be transmitted even after the Chamberland-Pasteur filter had removed all viable bacteria from the extract. After many years it was proved that these filterable infectious agents were not very small bacteria, but were a new type of tiny, disease-causing particle that later came to be known as virus.

So, the correct answer is 'Filterable agents'