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These diseases result from a variety of infectious agents including bacteria, rickettsia , viruses and protozoa, or they may be caused by substances produced by the tick.
Biological weapons can come in a variety of forms, including viruses, bacteria, and rickettsia (bacteria that can live inside host cells like viruses).
Typhus is caused by rickettsia , bacteria-like microorganisms transmitted through blood-sucking insects such as fleas, lice, and ticks.
It usually takes several hours of attachment and feeding before the rickettsiae are transmitted to the host.
Serology showed no recent mycoplasma, legionella, or rickettsial infection, and a serum cryptococcal latex agglutination test was negative.
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