Not really my area, but I'd guess the smallest viruses are a lot smaller. They don't have to function at all, just deliver a packet of genetic material to a ta

Not really my area, but I'd guess the smallest viruses are a lot smaller. They don't have to function at all, just deliver a packet of genetic material to a target. So they don't have to be very large, just that genetic material plus stuff to protect it and to get into the target and attack.