Etiology

* Microscopic examination of infected material ("smear") detects about 8 to 10 x

10 mm /organisms of specimen using the older AFB (acid-fast bacillus) stain. The newer auraminerhodamine fluorsecent technique is one-third more sensitive. A smear-

negative patient still can grow M tuberculosis on culture, which is more sensitive than either staining technique. Unfortunately, culture is much slower than staining due to the doubling time of the bacilli of about 20 hours. Further, microscopic examination cannot determine which of over 90 mycobacterial species is present. The usual practice is to assume the worst (TB) until confirmed by genetic probe or positive culture.

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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