Category: M

A virus that ordinarily occurs in the host in a noninfective state but is activated and demonstrated by indirect methods.  

A container that holds more than one dose of a medication.  

The maximum amount of gas that can be ventilated into and out of the lungs in a voluntary effort in a given time, measured in liters per minute.  

The normal maximum breathing pattern that can be maintained for 15 min (usually approx. 60% of maximum voluntary ventilation).  

Ventilatory support that provides mechanical breaths when the patient’s spontaneous breathing does not occur frequently enough.  

A vector in or upon which growth and development of the infective agent do not occur.  

Variation in number as opposed to kind.  

Expansion of a balloon in the orifice of a mitral valve as a means of treating mitral stenosis, instead of mitral valve replacement or commissurotomy.  

A live attenuated vaccine used to prevent mumps. Its use should be governed by the same restrictions listed for live attenuated measles virus vaccine.  

A vaccine prepared from bacterial polysaccharides from certain types of meningococci. Meningococcal polysaccharide vaccines A, C, Y, and W135 are available for preventing diseases caused by those serogroups. A vaccine for meningococcal serogroup B is not available.