W. David Colby IV MSc MD FRCPC


Tuberculosis (TB)

What is tuberculosis? Tuberculosis (TB) is an infection caused by slow-growing bacteria that grow best in areas of the body that have lots of blood and oxygen. That’s why it is most often found in the lungs. This is called pulmonary TB. But TB can also spread to other parts of the body, which is called extrapulmonary…

Salmonella

Salmonella bacteria are commonly found in the intestines of birds, reptiles, and mammals. The bacteria can spread to humans from handling waste from infected animals or consuming undercooked meat, juice from raw meats, or other contaminated foods. The illness caused by salmonella—salmonellosis—produces fever, diarrhea…

Salpullido de la enfermedad de Lyme

Un síntoma de la enfermedad de Lyme es un salpullido rojo (llamado eritema migrans). El salpullido suele comenzar como una pequeña zona roja y luego se expande por varios días. El salpullido ocurre en el sitio de la picadura de la garrapata y suele agrandarse con el tiempo. A veces, el salpullido desaparece en el…

Post-Polio Syndrome

Post-polio syndrome (PPS) is a condition that can develop several decades after a person has had polio (poliomyelitis). PPS affects the muscles and nerves, causing weakness, tiredness, pain, and other symptoms. Unlike polio, post-polio syndrome is not contagious. Muscles whose nerves were damaged by polio are the ones…

Spores

Spores are reproductive parts of certain organisms, such as fungi or mosses. Although they come in many different sizes, shapes, and colors, most spores are visible only by looking at them with a microscope. Spores are similar to seeds because when a single spore is in the right environment, it can grow into an larger…