Three types of carriers are commonly discussed in science, medicine, and everyday language, each carrying something different. First, an infectious disease carrier is a person or animal that carries bacteria or viruses that cause illness without showing symptoms themselves but can transmit the disease to others. Examples include asymptomatic carriers of COVID-19 who feel healthy but spread the virus, or mosquitoes that carry malaria parasites and carry them to humans through bites. Second, a genetic carrier is a person who carries one copy of a mutated gene for a recessive genetic disorder like cystic fibrosis, sickle cell anemia, or Tay-Sachs disease. Genetic carriers do not have the disease because they have only one mutated copy and one normal copy, but they can pass the mutated gene to their children, and if both parents are carriers, the child has a 25 percent chance of having the disease. Third, a commercial or logistics carrier is a company that carries goods or people, such as an airline carrier like Delta that carries passengers, a shipping carrier like FedEx that carries packages, or an HVAC carrier brand like Carrier that carries cool air through air conditioners and heating systems made by Carrier Global Corporation, which owns Bryant.
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