injuries poisoning
Tick Paralysis
Introduction
Tick paralysis is a rare, ascending, flaccid paralysis that occurs when toxin-secreting Ixodidae ticks bite and remain attached for several days. In North America, some species ofDermacentorandAmblyommacause tick paralysis due to a neurotoxin secreted in tick saliva. The toxin is not present in tick saliva during early stages of feeding, so paralysis occurs only when a tick has fed for several days or more. A single tick can cause paralysis, especially if it is attached to the back of the skull or near the spine. Symptoms and signs of tick paralysis include anorexia, lethargy, muscle weakness, impaired coordination, nystagmus, and ascending flaccid paralysis. Bulbar or respiratory paralysis may develop. Diagnosis is based on clinical findings. Tick paralysis should be considered in North American patients with acute ascending flaccid paralysis or bulbar paralysis; ticks should be sought over the entire body surface and be removed. Differential diagnosis includes Guillain-Barré syndrome, botulism, myasthenia gravis, hypokalemia, and spinal cord tumor. 