1 An older antibiotic, but still in use, and effective where you might be allergic to the penicillins. However, it may cause various types of stomach upset, and so is usually kept in reserve.  Clindamycin is the 500lb. gorilla of tooth abscess antibiotics used in dentistry.
A communicable disease is an illness transmitted through contact with microorganisms. People, animals, food, surfaces, and air can all be carriers of the microorganisms that pass infectious illnesses from one host to the next.
The predominance of infectious diseases is shifting to non communicable or chronic disease. Non-communicable diseases (NCDs) include a range of chronic conditions, including cancer, diabetes, cardiovascular disease, hypertension, as well as Alzheimer's and other dementias. They are commonly thought of as diseases of affluence.