Convalescent carriers are those who have recovered from their illness but remain capable of transmitting to others. Incubatory carriers are those who can transmit the agent during the incubation period before clinical illness begins. Asymptomatic or passive or healthy carriers are those who never experience symptoms despite being infected. ![]() As noted earlier, a carrier is a person with inapparent infection who is capable of transmitting the pathogen to others. Human reservoirs may or may not show the effects of illness. Because humans were the only reservoir for the smallpox virus, naturally occurring smallpox was eradicated after the last human case was identified and isolated.8 Diseases that are transmitted from person to person without intermediaries include the sexually transmitted diseases, measles, mumps, streptococcal infection, and many respiratory pathogens. Many common infectious diseases have human reservoirs. ![]() For example, the reservoir of Clostridium botulinum is soil, but the source of most botulism infections is improperly canned food containing C. The reservoir may or may not be the source from which an agent is transferred to a host. Reservoirs include humans, animals, and the environment. The reservoir of an infectious agent is the habitat in which the agent normally lives, grows, and multiplies. Department of Health and Human Services 1992. ![]() Source: Centers for Disease Control and Prevention.
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