What body part is affected by the T4 virus?

The T4 virus primarily affects bacteria, specifically the Escherichia coli (E. coli) bacterium. It is a bacteriophage, meaning it infects bacterial cells and hijacks their machinery to replicate itself. By doing so, it can ultimately lead to the lysis (destruction) of the bacterial cell. Thus, while T4 does not affect human body parts, it targets bacterial cells in its host.