An engorged longhorned tick. Photo: Aukid Stock photo

A tick species new to the U.S., called the longhorned tick or Haemaphysalis longicornisa. has been found spreading along the East Coast, state and federal officials say.

Why it matters: They have the ability to carry serious diseases — sometimes ones causing death in other countries — but officials say there have been no reports of human infections in the U.S. yet, per the New York Times.

Four things to know about longhorned ticks:

  1. The first one was found in America last summer on a sheep in New Jersey, although how the tick got there remains unknown. Since then, they've been found in at least 7 states along the eastern seaboard: Arkansas, New York, West Virginia, New Jersey, Virginia and Pennsylvania.
  2. In its original home in Asia, the longhorned tick transmits a disease called severe fever with thrombocytopenia syndrome (SFTS) that kills 15% of its victims, NYT says. But New Zealand and Australia say the ticks don't appear to cause SFTS there — instead, the ticks have transmited babesiosis and theileriosis, which can be damaging for cattle but don't usually harm humans.
  3. The Centers for Disease Control and Prevention operates a lab in Colorado with 10 live longhorned ticks that they hope to grow to maturity to test for further possible diseases. That will take about a year.
  4. Female longhorned ticks can reproduce asexually. After they feed, they can lay 2,000 eggs, which can swarm an animal, sucking enough blood to cause anemia or death, Business Insider reports. Young longhorned ticks are extremely small, and have been compared to a speck of dust or a poppy seed.

The big picture: Officials say they are keeping a watchful eye on this new species, particularly as it comes amid a concerning growth in other tick populations across the U.S., primarily due to warmer temperatures and a greater mobility of people and animals.

Go deeper

Updated 11 mins ago - Politics & Policy

Unrest in Philadelphia after fatal police shooting of Black man

Demonstrators rally on Tuesday near the location where Walter Wallace was killed by two police officers in Philadelphia, Pennsylvania. Photo: Mark Makela/Getty Images

The Pennsylvania National Guard was mobilized Tuesday during a tense second night of protests in Philadelphia over the fatal police shooting of Walter Wallace, a 27-year-old Black man.

Driving the news: Philadelphia Mayor Jim Kenney (D) and Police Commissioner Danielle Outlaw said in a joint statement Monday that police were launching a "full investigation" to answer questions that arose from video that captured part of the incident with police.

Updated 1 hour ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Politics: Obama: Trump is "jealous of COVID's media coverage" Axios-Ipsos poll: Federal response has only gotten worse.
  2. Health: Hospitals face a crush — 13 states set single-day case records last week.
  3. Business: Winter threat spurs new surge of startup activity.
  4. Media: Pandemic causes TV providers to lose the most subscribers ever.
  5. States: Nearly two dozen Minnesota cases traced to three Trump campaign events.
  6. World: Putin mandates face masks.
3 hours ago - Sports

Los Angeles Dodgers win World Series

Mookie Betts slides home safely to give the Dodgers a 2-1 lead. Photo: Tom Pennington/Getty Images

The Los Angeles Dodgers won their seventh World Series in franchise history with a 3-1 Game 6 victory over the Tampa Bay Rays on Tuesday. Shortstop Corey Seager was named the series MVP.

The big picture: It's the Dodgers' first championship since 1988, though they've won the NL West division in eight straight seasons and reached the World Series three times in the last four years.