Santa Ana homeless (Frederic J. Brown / AFP / Getty)

14,000 Used Needles at OC River Homeless Camps

Orange County found 13,950 used hypodermic needles left by evicted homeless people along the Santa Ana River, confirming public health concerns that led to the camps’ removal.

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Legionnaires’ Disease Outbreak Shutters Texas Hotel

A Central Texas hotel temporarily closed its doors last week once public health officials disclosed an outbreak of Legionnaires’ disease, a severe and sometimes deadly form of pneumonia.

A female Aedes aegypti mosquito is seen on the forearm of a health technician in a laboratory conducting research on preventing the spread of the Zika virus and other mosquito-borne diseases in Guatemala City, February 4, 2016. REUTERS/Josue Decavele

Pandemic Risk: Zika Mosquitos in 129 California Cities

The mosquitos that can carry the Zika virus have reportedly appeared in 129 California cities. With cold winter weather the only major obstacle to the Zika virus becoming America’s first pandemic since the 1957 Asian Flu, ground zero for a potential pandemic is now the West Coast.

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Measles Outbreak Strikes Again In Los Angeles

Two years after a large Measles outbreak broke out at Disneyland in Southern California and spread internationally, an outbreak of the disease is back with nine confirmed cases in Los Angeles County. The Los Angeles County Department of Public Health

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Miami Reports Three More Zika Transmissions

Three more cases of Zika virus transmission have been reported from the outbreak area in northern Miami, making a total of 25 cases reported to date.

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New Vaccine Mandate Takes Effect In California

California Parents saw the institution of a new vaccine mandate on Friday barring new students from entering or seventh graders from advancing in school unless they have a list of shots required by the state pushing some parents to move out of state.

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Zika Virus Expected to Spread at Texas-Mexico Border

Thirty-five cases of the Zika Virus have been reported in Texas but the virus is expected to spread in the Lone Star State during mosquito season. The threat is especially likely near the Texas-Mexico border and along the Gulf Coast.

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PHOTOS: Brazilians Disguised as Zika Mosquitoes Storm Opening Day of Carnival

As Brazil struggles to contain the Zika virus in what has now become a pandemic, the nation officially begins its annual Carnival. Despite experts deeming the scantily clad nationwide block party an “explosive cocktail” for a mosquito-borne illness, thousands are expected to flood the streets of the nation’s biggest cities and have a good time.

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Zika Threat In India: Doctors Race to Avoid Pandemic

There have not been any cases of the Zika pandemic reported in India yet, but health authorities are nervous for several reasons, not least of which is that India has already dealt with Zika in the past, logging some of the oldest known cases of infection.

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Brazil Sterilizes Olympic Stadiums Over Zika Virus

Brazil authorities ordered health workers to sterilize Rio de Janeiro’s Sambadrome, which will serve as the center of the 2016 Summer Olympics, over the fear of the Zika virus.

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Winter Vomiting Virus Explodes in California

California health officials announced this week that the state is seeing a excessive uptick in the number of “winter vomiting disease” or norovirus cases from prior years.

Vaccine (Joe Raedle / Getty)

Vaccine Mandate, SB 277, Passes California Assembly

On Thursday, the California State Assembly passed the SB 277, which mandates child vaccinations as a condition of private and public school enrollment, by a vote of 46-30. Democrats and Republicans were divided within their own parties over the bill, which ultimately passed with bipartisan support. Due to amendments, however, the bill was immediately ordered back to the State Senate, where it previously passed.

San Diego cases of tuberculosis are double the national average …

San Diego TB Rate Is Twice the National Average

San Diego cases of tuberculosis are double the national average health officials say, raising again the question of the role of illegal immigration in the spread of very serious like tuberculosis (TB) in the United States.