W. David Colby IV MSc MD FRCPC


Relapsing Fever

Relapsing fever is an infectious disease that can be passed to humans by ticks. Relapsing fever is most common in the western United States. Symptoms usually start 3 to 11 days (average 6 days) after the tick bite. They may last for several days, go away, and then return (relapse) several days later. Symptoms of…

Severe Acute Respiratory Syndrome (SARS)

What is SARS? Severe acute respiratory syndrome (SARS) is a respiratory illness that first infected people in parts of Asia, North America, and Europe in late 2002 and early 2003. SARS is caused by a type of coronavirus, which can cause mild to moderate upper respiratory illness, such as the common cold. This virus is…

Neisseria Meningitidis

Meningitis caused by Neisseria meningitidis is sometimes referred to as meningococcal disease. Some people have Neisseria meningitidis in their throats without getting sick. But they can pass it to another person, who may get sick. Neisseria meningitidis causes meningitis in about 25 out of 100 people who get the…

Meningitis

Meningitis is swelling of the lining around the brain and spinal cord. It can cause you to have a stiff neck, a fever, a headache, vomiting, trouble staying awake, and seizures. It is usually caused by a virus or bacteria. You can spread the germs that cause meningitis through coughing or close contact. Some types of…

Chronic Lyme Arthritis

Chronic Lyme arthritis is a recurring form of joint inflammation caused by Lyme disease, a bacterial infection that is spread through tick bites. Symptoms of chronic Lyme arthritis include episodes of swelling, redness, and fluid buildup in one or more joints that last up to 6 months at a time. When a person is not…