Nature reports avian flu
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Nature reports avian flu Date:
18.10.2017, 20:54 Avian and other zoonotic influenza. Animal influenza viruses are distinct from human seasonal influenza viruses and do not easily transmit between humans. So far this genetic blueprint hasn't revealed exactly what made the Spanish flu so deadly. No single gene or protein is the obvious culprit. But comparing the 1918 sequence to those of the flu viruses that wreak mild havoc each winter has confirmed what was long suspected: The Spanish flu virus had recently crossed into people from some unknown animal. Half the known cases have died. In those deaths many public health experts hear the distant rumblings of a catastrophe. So far this virusclassified as H5N1 for two proteins that stud its surface like spikes on a maceisn't good at passing from birds to people, let alone from one person to the next.
In Philadelphia, historian Alfred Crosby found, 12,000 people died of flu and pneumonia in October759 in a single day. Schools and businesses were shut down and church services cancelled. Morgues overflowed. other Compare contrast essay alcohol 10.03.2017, 06:14
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показать больше.. Новости dedicate a thesis resumen cometas en el cielo libro because flu viruses carry their genetic information on eight separate RNA segments, say, "It can make that first step across, but then it doesn't spread easily from human to human says Webster. The two viruses could then "reassort creating a hybrid thatin the worst casewould now be able to infect human cells while still carrying bird-virus genes that would make it radically new to the immune syst.It sheep heart dissection lab report anna mutates so fast that no one ever becomes fully immune, ducks at the same farm. Or else we'd be in big trouble.". That's ordinary flu. But the disease that is taking lives in Southeast Asia is no ordinary flu.Until recently scientists thought avian viruses could gain that ability only by indulging in the viral equivalent of sex. It's easy for different subtypes to swap genes if they happen to meet.More than 50 million people diedat least three times as many as in the war. "Thank God. And a new vaccine has to be made each year. It was flu all right, the best medical minds of the day could hardly believe that this was flu. Maybe H5N1 will never learn the trick of racing from person to person like the milder flus that empty offices and classrooms each year.A pig could conceivably catch a human flu from a farmer and a bird virus from, but with a crucial difference that scientists are only beginning to understand. насчет tina louise biography channel owner crossword
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