All three viruses stunt growth, cause mosaic, and leave fruits deformed and mottled. Vegetable viruses may be invisible as they slip into plants and reproduce, but the trouble they cause with fruit is apparent. These zucchini show the disfigurement typical of viral infection. In most cases, it is impossible to diagnose the specific virus by observing the symptoms because the symptoms often mimic other plant problems. Luckily, plant viruses attack only the cells of their host plants.
Plant viruses have no effect on the health of people or animals.
You almost certainly have safely eaten virus-infected fruits and vegetables many times. Without means of self-propulsion, viruses cannot move or enter plant cells on their own. They must catch a ride into a plant cell through a wound. Even the tiniest tear in a surface cell is enough, and routine gardening practices, even touching, can break open a cell. TMV can withstand the curing of tobacco and its processing into cigarettes.