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It's one souvenir you really don't want to bring home.

Angiostrongylus cantonensislarva
CDC
▼ You may have read a thing or two lately about the oh-so-grossly-named rat lungworm. The Centers for Disease Control and Prevention recently confirmed three new cases in Hawaii since December 2018. The brain parasiteisn't new, but only became routine in the United States in recent years.
Angiostrongylus cantonensisfavors tropical climes, and used to crop up only in Asia and some parts of the Caribbean. But after seeing just a pair of cases in the preceding decade, Hawaii reported nine cases in just three monthsback in spring of 2017—six on Maui and three on the Big Island. The three newly-reported cases bring Hawaii's 2018 count to 10 confirmed rat lungworm infections. 2019 has had five reported cases so far. All three of the newly described patients were vacationers from the mainland, so travelers might have cause for concern. But the continental U.S. should not be complacent: the infection now shows up with some regularity in California and along the Gulf Coast, and has even been spotted in Oklahoma. International travel and trade has aided the parasite's spread, and some researchers worry climate change will further increase its global reach.
So whether you're headed off to a dream vacation in Hawaiior nervously eyeing the news from your couch in Alabama, here's everything you need to know about these gnarly brain invaders.
What is it?
Angiostrongylus cantonensis, known as the rat lungworm, is spread primarily by rats. The adult form of the parasite—a roundworm that can grow to around 2 cm long—only takes up permanent residence inside rodent pulmonary arteries. (▪ ▪ ▪)
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