Category: M

The use of vaccines during an outbreak of a communicable disease in an attempt to prevent an epidemic. In the U.S. mass vaccinations are sometimes carried out in schools and hospitals during meningitis or hepatitis epidemics.  

A urine specimen collected after the first few milliliters of urine are voided and discarded.  

Motion mode display: an ultrasonic display mode in which the motion of structures is seen on the vertical axis of the display, used, e.g., to show the movement of the heart’s valves and walls during diastole and systole.  

A louse-borne epidemic typhus present in certain portions of Mexico.  

A tumor composed of tissue that resembles mesenchymal cells.  

A benign tumor of the jaw, occurring mostly during the first year of life.  

A benign nodular accumulation of mast cells.  

One of the embryonic tubules that in the female gives rise only to vestigial structures but in the male gives rise to the efferent ducts of the testes.  

Mycobacterium tuberculosis bacilli that are resistant to therapy with at least two standard antitubercular drugs (especially isoniazid and rifampin, the two drugs that have formed the cornerstone of therapy for tuberculosis). MDR-TB must be treated with at least three antitubercular drugs to which the organism is presumed or proven to be sensitive. About 3% of…

A small tubercle resembling a millet seed, caused by tuberculosis.