CDC and IDSA guidance hold that Borrelia burgdorferi typically requires 36 to 48 hours of tick attachment to transmit. Removing a blacklegged tick within the first 24 hours dramatically reduces the chance of infection. Cases of faster transmission have been reported but are exceptional.
A 2001 NEJM trial by Robert Nadelman and colleagues showed that a single 200 mg oral dose of doxycycline within 72 hours of removing an…
An unattached tick can crawl on a person for hours before biting. CDC's two-hour shower rule is based on field studies showing that…
A single Ixodes scapularis nymph the size of a poppy seed can deliver Borrelia burgdorferi after roughly 36 to 48 hours of attachment.…
An attached tick's level of engorgement is the most useful proxy for how long it has been feeding. A flat, unengorged tick is probably…
A single nymph the size of a poppy seed can deliver Borrelia burgdorferi in under 36 hours of attachment.
In a deer-tick mouse model, Powassan virus passed to naive mice after as little as 15 minutes of tick attachment. There appears to be no…