Bristol-Myers Squibb Co. is recalling more than 31,000 units of a chemotherapy drug after discovering one vial was overfilled, putting patients at risk of an overdose.

The company's action affects 10 lots of BiCNU, an injection of the drug carmustine, used to treat brain tumors, multiple myeloma, Hodgkin's disease and non-Hodgkin's lymphoma.

Six visitors to California's famous Yosemite National Park have now been infected with a rare rodent-born virus, two of whom have died, officials said Thursday, in an update on the outbreak.

Earlier this week Yosemite authorities closed down all tent cabins in part of Curry Village, a popular lodging area in Yosemite Valley, the tourist hub at the center of the scenic park visited by millions of people every year.

The West Nile virus, responsible for more than 60 deaths in the United States so far this year, has now claimed its first victim in the eastern state of Maryland, state health officials said Thursday.

"We reported 13 cases of West Nile virus that occurred since the 1st of July," a spokeswoman for the state health department, Dori Henry, told Agence France Presse.

Water-pipe smoking is as bad as deeply inhaling cigarette smoke when it comes to causing respiratory problems, according to a study published on Thursday.

Researchers led by Mohammad Hossein Boskabady at Masshad University of Medical Sciences in Iran monitored lung functions among 57 local water-pipe smokers, 30 deep-inhalation cigarette smokers and 51 normal-inhalation smokers.

Gripped by its worst cholera outbreak in nearly 15 years, which has already left 229 dead, Sierra Leone is likely to see cases triple in the next month as the rainy season hits its peak, estimates show.

In Freetown, the densely populated seaside capital, makeshift houses without toilets or running water crowd the muddy green hills surrounding the city. Slums cluster on the seafront, where rubbish chokes streams and children play in dirty water.

Researchers on Thursday sounded the alarm over drug-resistant tuberculosis, calling it a curse that was swiftly becoming more difficult and costly to treat.

In eight countries they studied, 43.7 percent of TB patients did not respond to at least one second-line TB drug, a strategy used when the most powerful first-line drugs fail.

Head of the hospital bed raised? Check. Patient's teeth brushed? Check.

Those simple but often overlooked steps can help protect some of the most critically ill patients — those on ventilators — from developing deadly pneumonia. And if they knew about them, family members could ensure the steps weren't forgotten.

The European rights court Tuesday condemned Italy for its ban on screening embryos for genetic conditions, saying its laws leave couples wanting to avoid passing on diseases little room for maneuver.

The condemnation from the European Court of Human Rights relates to the case of an Italian couple, both carriers of cystic fibrosis, who were blocked from using in vitro fertilization (IVF) to select embryos that were not affected by the condition.

One of New York's most expensive neighborhoods will be sprayed this week with pesticide to combat the West Nile virus, officials said Tuesday.

The city regularly sprays against the mosquito-borne disease, which has seen a surge in outbreaks in the United States this year. Friday's spraying is notable because it will target Manhattan's prestigious Upper West Side neighborhood and parts of the famed Central Park.

A second person has died of a rare, rodent-borne disease after visiting Yosemite National Park earlier this summer and park officials warned past visitors to be aware of some flu-like aches and symptoms.

Health officials learned this weekend of the second hantavirus death, which killed a person who visited the park in June, spokesman Scott Gediman said in a statement.