Overview 1, 2, 3, 4, 5 Pertussis is a highly communicable, vaccine-preventable disease that affects the respiratory tract. The illness is caused by Bordetella pertussis (B. pertussis) bacteria, for which humans are the only known natural reservoir.verview 1, 2, 3, 4, 5 Pertussis is a highly communicable, vaccine-preventable disease that affects the respiratory tract. The illness is caused by Bordetella pertussis (B. pertussis) bacteria, for which humans are the only known natural reservoir.
Often, cramps. 1  a sudden, involuntary, spasmodic contraction of a muscle or group of muscles, especially of the extremities, sometimes with severe pain. 2  a piercing pain in the abdomen.
A muscle cramp is a strong, painful contraction or tightening of a muscle that comes on suddenly and lasts from a few seconds to several minutes. It often occurs in the legs. A muscle cramp is also called a charley horse. Nighttime leg cramps are usually sudden spasms, or tightening, of muscles in the calf. muscle cramp is a strong, painful contraction or tightening of a muscle that comes on suddenly and lasts from a few seconds to several minutes. It often occurs in the legs. A muscle cramp is also called a charley horse. Nighttime leg cramps are usually sudden spasms, or tightening, of muscles in the calf.