Why is a virus that infects humans not likely to infect a pet?
They can only infect specific types of cells
A virus that infects humans is not likely to infect a pet because different species have different receptors on their cells, and viruses require specific receptors to infect a cell. Therefore, a virus that has evolved to infect humans cannot necessarily infect pets. Additionally, the immune systems of different species can recognize and respond to viruses in different ways, so even if a virus were able to infect a pet, it might not be able to establish an infection or cause disease. It is also possible for a virus to have a narrow host range, meaning that it can only infect a specific group of closely related species, and humans and pets may not be included in that group.
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