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An example of vertical transmission of disease includes which of the following?

  1. Breast milk

  2. Sexual transmission

  3. Mosquitoes

  4. Contaminated food

The correct answer is: Breast milk

Vertical transmission refers to the passing of a disease or infectious agent from one generation to the next, typically from mother to child during pregnancy, childbirth, or breastfeeding. Breast milk is a well-established route for vertical transmission as certain infections, such as HIV, can be transmitted when the virus is present in the breast milk. This highlights how certain pathogens can be transmitted directly from a mother to her offspring, thereby exemplifying vertical transmission. In contrast, the other options do not represent vertical transmission. Sexual transmission involves the transfer of infections between individuals during sexual activity, not directly from parent to child. Mosquitoes act as vectors for diseases, allowing pathogens to be transmitted between hosts without direct parent-child linkage. Contaminated food causes foodborne illnesses, which involve transmission between individuals consuming the contaminated product but do not imply vertical transfer from parent to offspring.