Reuters Health News Summary

Following is a summary of current health news briefs.

Novo Nordisk hit hard as U.S. rebuffs insulin drug

COPENHAGEN (Reuters) - U.S. regulators have dealt a major blow to Novo Nordisk's <NOVOb.CO> hopes for its new long-acting insulin Tresiba by demanding the Danish drugmaker conduct more clinical tests to assess potential heart risks. Shares in Novo, the world's top insulin maker and Denmark's largest company, slumped 12 percent as the group said the decision would make it harder to meet long-term financial targets, while rival Sanofi <SASY.PA> rose 4 percent.

No horsemeat fraud committed in Romania, PM says 2013-02-11T123924Z_1_BRE91A0FE_RTROPTC_0_US-BRITAIN-HORSEMEAT-R OMANIA.XML () -

Working out when to exercise in the cold and flu season

NEW YORK (Reuters) - Sniffles, runny noses and flu-like symptoms can deter, delay and even derail many exercisers just when enthusiasm for that New Year's resolution is beginning to flag. Health and fitness experts advise to starve a fever of exercise. But feeding a cold moderately, with a brisk walk, may not be a bad idea.

Bayer's Riociguat submitted for approval in U.S., EU

FRANKFURT (Reuters) - German drugmaker Bayer <BAYGn.DE> on Monday said it had submitted Riociguat, a drug to treat patients with two forms of pulmonary hypertension, for regulatory approval in the United States and the EU. The drug is used to treat chronic thromboembolic pulmonary hypertension (CTEPH) and pulmonary arterial hypertension (PAH), Bayer said.

Teen births continue to decline in U.S

NEW YORK (Reuters Health) - The number of U.S. babies born to teen mothers dropped to record lows in 2011, according to new data from the Centers for Disease Control and Prevention. Fewer women also gave birth in their 20s than in prior years, researchers found - but the birth rate increased for those in their late 30s and early 40s.

Two infected with bird flu in southwest China

BEIJING (Reuters) - Two people in southwest China have tested positive for the H5N1 bird flu virus and are critically ill, state news agency Xinhua said on Sunday, citing the Chinese health ministry. A 21-year-old woman and 31-year-old man in Guiyang had tested positive for the highly pathogenic H5N1 virus on Sunday after developing symptoms on February 2 and February 3 respectively, Xinhua cited health authorities as saying.