THURSDAY, May 9, 2019 (HealthDay News) — The number of Americans infected with hepatitis A has grown nearly 300% in just three years, health...

THURSDAY, May 9, 2019 (HealthDay News) — The number of Americans infected with hepatitis A has grown nearly 300% in just three years, health officials reported Thursday.

The staggering increase has come despite an effective vaccine and is seen mostly among drug abusers and the homeless, according to the U.S. Centers for Disease Control and Prevention.

Hepatitis A virus can linger in feces and be spread hand-to-hand, with infection occurring when a hand contaminated by the virus touches the person’s mouth.

“In the previous decade, large outbreaks of hepatitis A were rare and mostly attributed to contaminated commercial food products,” noted lead researcher Dr. Monique Foster, an epidemiologist in CDC’s Division of Viral Hepatitis.

Although 2016 saw two outbreaks of hepatitis A caused by contaminated food, the main culprit of outbreaks has been the living conditions of drug addicts and the homeless, Foster said.

The vast majority of the thousands of U.S. cases between 2016 and 2018 involved person-to-person transmission, Foster added.

“Since the hepatitis A outbreaks were first identified in 2016, more than 15,000 cases, 8,500 hospitalizations and 140 deaths have been reported,” she said.

Although hepatitis A can make you very sick, it usually goes away by itself in about six months, after which you become immune, explained Dr. Marc Siegel, a professor of medicine at NYU Langone Medical Center in New York City.

Hepatitis A attacks the liver, he said. Those most likely to develop serious liver illness are those with other conditions like cancer or those whose immune systems are not functioning normally.

The most effective defense against this potentially deadly infection is vaccination, which is also the best way to prevent outbreaks, Foster said.

“Since the widespread availability of the hepatitis A vaccine and recommendations to vaccinate children, the overall rate of hepatitis A infections has decreased dramatically in the U.S.,” she said.

But a large population of susceptible, unvaccinated adults who were not infected during childhood remain vulnerable to infection, Foster said.

This includes people who use drugs, homeless people, and gay and bisexual men, she said.

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