In what's being hailed as a breakthrough, two new studies show that the same pills used to treat the HIV virus can also be used to boost protection against the infection.

The studies show that the drugs can reduce transmission of the HIV virus by as much as 70% among heterosexual couples.

Dr. Jonathan Mermin, the director of the Center for Disease Control's division of HIV and AIDS prevention, joins Kiran Chetry on American Morning to discuss the studies, their implications and whether the drugs could help eliminate HIV/AIDS for future generations.

A new article posted in the Journal of the American Medical Association suggests that the government should consider removing obese children from their homes and putting them into foster case where they could perhaps be exposed to fewer negative environmental factors that lead to obesity.

While some experts say that the article is well-intentioned, many are outraged, cautioning that this is not the proper way to address childhood obesity.

Elizabeth Cohen, senior medical correspondent, takes a look at the controversy today on American Morning.

Researchers announced yesterday that for the first time, a patient has received a synthetic windpipe that was created in a lab with the patient's own stem cells and without using human donor tissue.

On June 9, doctors implanted the synthetic trachea into a 36-year-old man with late-stage tracheal cancer at Karolinska University Hospital in Stockholm.

The patient, who had exhausted every other treatment available, is doing well and expected to be released from the hospital today.

Elizabeth Cohen, senior medical correspondent, discusses the procedure this morning with Kiran Chetry and Christine Romans, explaining if the treatment will now be available for other cancer patients.

A new study was announced yesterday by Autism Speaks, the world's largest autism science and advocacy organization,  which suggests that while genetics play a role in autism, environmental factors - like parental age, low birth weight, multiple births, and maternal infections during pregnancy–may increase risks for ASD.

Elizabeth Cohen, senior CNN medical correspondent, joins American Morning today to explain the details of the study and to discuss how researchers reached their conclusions about the development of the disorder.

Adding to a growing list of concerns about the popular anti-smoking drug Chantix, researchers for a new study from the Canadian Medical Association Journal have found that taking the drug increases a smokers risk of having a heart attack by 72%.

Elizabeth Cohen, CNN senior medical correspondent, weighs in on these new warnings with Ali Velshi and Christine Romans this morning.