Since 2012, the Centers for Disease Control and Prevention (CDC) has suggested that all pregnant women receive the Tdap vaccine, even if they were vaccinated earlier in life. And new research found that Tdap was safe for both mom and baby.

The outbreak of chikungunya in Central America, South America and the Caribbean — which began last December — is still spreading. The CDC recently warned travelers to take precautions when traveling to affected regions.

Despite recent decreases in new Ebola cases in hard-hit Liberia, the fight against Ebola isn't over. After recent case spikes in Guinea and Sierra Leone, health officials have taken several new measures to combat the virus both abroad and in the US.

Pneumonia can be a serious illness that can lead to time in the hospital for little ones. But a new vaccine may prevent the disease in this population.

The US Food and Drug Administration (FDA) approved a new combination treatment for hepatitis C infection Wednesday.

After reports last week that the rate of new Ebola cases in Liberia was slowing, new reports indicated a spike in cases in Guinea and Sierra Leone. Meanwhile, Texas, where a few cases broke out in October, hasn't seen a new case in 21 days.

Chagas disease is usually thought of as a tropical disease, found in places like Guatemala or Brazil. But researchers recently found that the parasite that causes Chagas disease was present in the blood of some Texans.

Recent reports suggest that the new Ebola case rate in Liberia, one of the hardest-hit countries in the Ebola outbreak in West Africa, may be slowing. But health officials remain cautious about relaxing the fight against the virus.

Health officials announced Friday that millions of doses of two experimental Ebola vaccines could be ready to use in 2015. If they prove effective, the vaccines could be a boost to the fight against the current West African Ebola outbreak that has claimed more than 4,800 lives.

A New York City doctor who recently returned from treating Ebola patients in West Africa tested positive for Ebola Thursday. Health officials placed the patient in isolation and began the search for people who might have come into contact with him.