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8 Cards in this Set

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Primary geographic distribution of Lyme disease?

Northeastern United States

What is the vector?

tick - Ixodes Scapularis species most common (Robin of Ixodes... robinhood playing in archery competition)

Ticks larvae feasts on which animal? How about the adult form?

Mouse is the reservoir (and host of larvae)-> larvae.




Obligatory host is the Deer -> host of adult tick

Do humans play an obligatory role?

no, we are considered incidental or 'dead end' host

Do spirochetes gram stain?

no because they have very thin walls.

_________ is the only spirochete that can be visualized under a microscope. The others you cant.

Borrelia. use wright stain and giemsa stain.




Treponema and leptosperia are the other two that you cant see.

What are the stages of Borrelia? Hint: progressively more challenging...

1: characteristic rash - erythema migrans (bulls eye) - usually occurs within a month of tick bite. Also have flu-like illness (fever and chills)




2: Heart block - caused by myocarditis; bilateral facial nerve palsy (idiopathic ones are called bell's palsy)




3: arthritis of large joints (ex: knee) Migratory polyarthritis (swinging straw man); can also have memory difficulty, and confusion caused by subtle encephalopathy.

Treatment?

Doxycycline (unicycle)




Ceftriaxone (three axes) - used for more severe and later stages of infection