Viruses are microscopic parasites, generally much smaller than bacteria. The virus cannot reproduce itself outside the host because it lacks the complicated machinery that a [host] cell possesses. For viruses to multiply, they usually need support of the cells they infect. This animation explains how does it happen.
A joint Urdu dubbing project of Mashal Books and the Eqbal Ahmad Centre for Public Education with generous support from Nasser Ahmad / The i-Care Foundation.
Special thanks to Vaccine Makers Project.
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