Scrub Typhus/complications; Shock, Septic/microbiology; Adult; Aged; Animals; Arachnid Vectors/microbiology; Aspartate Aminotransferases/blood; Bilirubin/blood; Blood Urea Nitrogen; Creatinine/blood; Disseminated Intravascular Coagulation/microbiology; Dyspnea/microbiology; Endemic Diseases/statistics & numerical data; Female; Fever/microbiology; Headache/microbiology; Hematocrit; Hospitalization/statistics & numerical data; Humans; Hypoalbuminemia/microbiology; Leukocytosis/microbiology; Lymphatic Diseases/microbiology; Male; Middle Aged; Mites/microbiology; Multiple Organ Failure/microbiology; Prospective Studies; Respiratory Insufficiency/microbiology; Scrub Typhus/blood; Scrub Typhus/diagnosis; Scrub Typhus/epidemiology; Shock, Septic/blood; Shock, Septic/diagnosis; Shock, Septic/epidemiology; Thailand/epidemiology; Thrombocytopenia/microbiology