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What is meant by fall by crisis or lysis in fever ?

Fever can subside in the following ways
Crisis
Elevated body temperature settles down to the baseline value immediately after starting treatment. This may be accompanied by diaphoresis, diarrhoea or diuresis.
  • Acute lobar pneumonia.
  • Rheumatic fever
  • Enteric fever with intestinal haemorrhage  or perforation.
  • Adrenal crisis (seen in meningococcal meningitis).
  • Septicaemic shock.
Lysis 
  • Elevated body temperature settles down to normal in step ladder pattern in typhoid fever