Christine Hahn MD


Lyme Disease Rash

One symptom of Lyme disease is a red rash (called erythema migrans). The rash usually starts as a small red area and then expands over several days. The rash occurs at the site of the tick bite and usually gets bigger over time. Sometimes the rash clears in the center, so that it looks like a bull’s-eye. About half the…

Flu Vaccine Myths

Many people choose not to have the influenza vaccine because of myths they believe about the disease or the vaccine. Myth: Influenza is a minor illness. Truth: Influenza and its complications caused from 3,000 to 49,000 deaths each year from 1976 to 2006 in the United States. 1 Myth: The vaccine causes the flu. Truth…

Lyme Disease Test

Discusses antibody test used to detect Lyme disease. Covers two types of test (enzyme-linked immunosorbent assay and Western blot test). Covers why and how they are done. Includes info on what results mean.

Western Black-Legged Tick

Source: Public Health Image Library (PHIL). James Gathany; William Nicholshon. Available online: http://phil.cdc.gov. Western black-legged ticks are one of two types of ticks in the United States that carry Lyme disease bacteria.

Lyme Disease: Role of Blood Tests

If you were exposed to ticks and you get an expanding, circular rash (erythema migrans), your doctor may treat you for Lyme disease without doing a blood test. Blood tests done in the first few weeks may not show Lyme disease even when you have the illness. This is because the body’s immune system responds slowly to the…