Tests underway to determine whether dolphin virus killed whales, too

The virus that has killed nearly 800 bottlenose dolphins off the East Coast has turned up in four whales that have washed ashore, a potentially troubling development if it is shown to be the cause of their deaths, a government marine expert said Thursday.

But it is too early to know whether cetacean morbillivirus killed three humpback whales and one pygmy sperm whale that have stranded since July 1 between Massachusetts and Georgia, said Teri Rowles, director of the marine mammal health and stranding response program for the National Oceanic and Atmospheric Administration’s fisheries service. A fourth humpback whale was too decomposed to allow reliable testing and results are not yet available on two other pygmy sperm whales, she said.

More health and science news

Have you used the new health insurance exchanges?

Have you used the new health insurance exchanges?

What has been your experience with the online insurance exchanges?

New procedure clones stem cells from adults

New procedure clones stem cells from adults

For the first time, scientists have created stem cell lines with identical DNA from two human adult males.

Earth-size, ‘Goldilocks’ planet in distant solar system

Earth-size, ‘Goldilocks’ planet in distant solar system

Kepler-186f, 500 light-years away, meets what researchers believe are two basic requirements for life.

FDA warns against common procedure to remove uterine fibroids

FDA warns against common procedure to remove uterine fibroids

The agency says the surgery risks spreading hidden cancers within a woman’s body.

The humpback has rebounded, but it is still listed as an endangered species.

“There are too many unknowns right now,” Rowles said. “We would be concerned if indeed there is an outbreak of this virus in humpback whales causing clinical disease and mortality.” Sometimes, she said, a marine population can carry a virus without it causing widespread harm.

There have been 14 humpback strandings — when dead or dying animals wash ashore — along the East Coast this year, double the six-year average of seven, she said. While that, too, is cause for concern, the total number is small. A network of stranding responders will continue to monitor the situation, she said.

Tests on a stranded common dolphin, a spotted dolphin and a harp seal did not reveal the presence of the virus, she said.

The die-off of bottlenose dolphins continues at an unprecedented pace, Rowles said. Between July 1 and Sunday, 782 have died, already surpassing the 740 dead in 1987 and 1988, during the last big outbreak of morbillivirus.

Generally, the virus causes death by suppressing the dolphin’s immune system, leaving it vulnerable to pneumonia and other infections. It poses no threat to people, despite its similarity to the measles virus, and there is nothing officials can do to protect dolphins in the wild.

Officials are beginning to see dolphins wash ashore in Florida as the cetaceans migrate south to warmer water, but haven’t included them in the total because tests have not yet conclusively linked the deaths to the virus.

 
Read what others are saying