Viral diseases can be transmitted through air, water,food, insect bites, and direct skin contact. Once a virus gains entry to the body, it reproduces by - taking over the host cell's machinery. deactivating the host cell's defense metabolizing cellular proteins. synthesizing host cell antibodies

The correct answer is: taking over the host cell's machinery.<br /><br />Once a virus gains entry to the body, it reproduces by taking over the host cell's machinery. Viruses are unable to replicate on their own, so they must infect a host cell and use its machinery to replicate their genetic material and produce new viral particles. This process involves the virus attaching to a host cell, entering the cell, and then using the cell's machinery to replicate its genetic material and produce new viral proteins. The new viral particles are then assembled and released from the host cell, which can then go on to infect other cells.