Final answer:
Diphtheria is to disease as chicken is to animal. Diphtheria is a respiratory infection caused by Corynebacterium diphtheriae that forms a pseudomembrane in the throat, whereas chickens are domesticated birds sometimes linked to infections such as salmonella when their meat is undercooked.
Step-by-step explanation:
Diphtheria is to disease as chicken is to animal. Diphtheria is a serious bacterial infection, caused by Corynebacterium diphtheriae, that affects the mucous membranes of the respiratory system. This illness is known for its characteristic pseudomembrane formation in the throat, which can result in obstruction of the airway and requires prompt medical attention. On the other hand, chickens are domesticated birds that have been a source of food and companionship for humans over generations. They are sometimes associated with certain infections when their meat is undercooked or when living in close proximity to humans, exemplified by diseases like salmonella enteritis.
While diphtheria can progress to cause complications such as myocarditis and nerve damage, chickens can also be linked to human diseases, like salmonella, though not as severe as diphtheria. The concept of geography of disease examines how infectious diseases like diphtheria have been prominent causes of death in developing countries in contrast to chronic, non-communicable diseases being more prevalent in developed areas. Lastly, the varicella-zoster virus, which causes chickenpox, is another example of disease associated, albeit only nominally, with the term 'chicken'.