Friday, 19 April 2013

Discovery of Resistant Bacteria in Sharks and Seals

Bacteria, viruses and parasites from land animals such as cats, cows and humans are sickening and killing sea mammals. Scientists have been finding a daunting number of land-based pathogens in seals, dolphins, sharks and other ocean dwellers that wash ashore dead or dying.

The "pollutagens" could pose a threat to people, too. Researchers are finding strains of bacteria that commonly infect people and are resistant to drugs. One harp seal had bacteria which were resistant to 13 of the 16 drugs tested by a team from Woods Hole Oceanographic Institution on Cape Cod. In recent years researchers have tested numerous sea mammals from various parts of the oceans to see which bacteria they harbor and the antibiotics those bacteria are immune to. 

The discoveries are worrisome for several reasons, Solomon writes: "A surfer or fisher with an open wound, or someone who gulps water while swimming, could get an infection that is hard to treat." Of course people also eat seafood that could harbor the germs. Solomon also notes that sea mammals "could serve as swimming Petri dishes, nurturing and transforming diseases until they re-emerge among humans as something new and more difficult to defeat."

Animal Bacteria Number of Drugs Resisted

Harp seal                  Chryseobacterium indologenes               13
Harbor porpoise      Sphingomonas multivorium                     12
Minke whale             Vibrio alginolyticus                                   10
Hooded seal              Pseudomonas sp.                                        8
Common dolphin      Pseudomonas sp.                                      8
Thresher shark        Pseudomonas sp.                                       8
Pygmy sperm whale  Providencia rettgeri                               7
Mako shark              Pseudomonas aeruginosa                        6
Pygmy sperm whale Sphingomonas paucimobili                  5
Grey seal                      Edwardsiella tarda                               3
Striped dolphin              Staphlycoccus                                     2

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