W. David Colby IV MSc MD FRCPC


Measurement of a Tuberculin Skin Test Reaction

Two to three days after getting a tuberculin skin test, the size of any bump at the site is measured. Your risk of having TB is used along with the size of the bump to determine whether the test is: Positive, meaning you have been infected with TB bacteria. Negative, meaning you have not been infected with TB bacteria…

Antigen Tests for Giardiasis

For a giardia antigen test, a stool sample or fluid from the upper part of the intestines (duodenal fluid) is tested in the lab for the presence of antigens from Giardia lamblia. This test is often done at the same time as a stool analysis.

Lyme Disease

Lyme disease is an illness from getting bitten by a tick infected with a certain type of bacteria. It can cause fatigue, headache, stiff neck, fever, sore muscles and joints, and sometimes a red rash that looks like a bull’s-eye. Antibiotics usually work. If you don’t get treated right away, Lyme disease can cause…

Garrapata del ciervo

Fuente: Public Health Image Library (PHIL). Michael L. Levin, PhD. Disponible en línea en: http://phil.cdc.gov. La garrapata del ciervo ( Ixodes scapularis ) es una de las dos clases de garrapatas en los Estados Unidos que son portadoras de las bacterias de la enfermedad de Lyme.

Haemophilus Influenzae Type B

The bacteria Haemophilus influenzae type b (Hib) can cause serious illnesses, including pneumonia (infecting the lungs), epiglottitis (infecting the tissue at the back of the throat), and meningitis (infecting the tissues around the brain and spinal cord). The Haemophilus influenzae type b vaccine has dramatically…