What is the most effective method to identify viruses within infected cell cultures?

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Observation of cytopathic effects in cultured cellsDetection of viral proteins in the infected cell layerPerforming the haemagglutination assayConducting the haemagglutination inhibition test

Explanation

The most reliable approach to confirm viral infection in cell cultures is by identifying cytopathic effects, which are structural changes in host cells caused by viral invasion. While detecting viral proteins and haemagglutination tests are useful, cytopathic changes provide a direct indication of viral activity in the culture.