鳥 インフルエンザA H7N9ウイルスは急速に耐性を取得する
El H7N9 adquiere rápidamente resistencias a los antivirales
El dato sería preocupante si no fuera porque la OMS no registra casos desde el 7 de mayo
Emilio de Benito Madrid 28 MAY 2013 - 16:58 CET
The H7N9 rapidly acquires resistance to antiviral
The data would be worrisome if it were not for the WHO no cases since May 7
Emilio de Benito Madrid 28 MAY 2013 - 16:58 CET
The H7N9 virus easily acquires resistance to antivirals. This confirms a study published in The Lancet with 14 cases. In these, three had mutations that made the virus immune to common drugs (oseltamivir and zanamivir). Of these, two died.
The news would be alarming if not combined with another: not sure how or why, the virus seems to have disappeared. After causing the alarm three months ago, the last case registered by the World Health Organization (WHO) is May 7.
The combination of news is a sign of how important it is monitoring these outbreaks of novel pathogens. And how sensitive is the issue of handling. WHO is clear: give all available information and accelerate research. At this time, 131 cases are registered (assuming that only the most severe of the thousands of you have probably been infected) with 36 deaths. This gives a mortality rate of 27.5%, very high for what is a flu virus.
moreThe first virus of the new eraH7N9: Flu Shanghai
In the study, Chinese researchers, who have assumed the leadership of the work on a virus that has not left its borders (there has only been one case in Taiwan, but ill in China), studied 14 people admitted. All had developed pneumonia and half needed assisted ventilation. The group was sampled respiratory system, from the upper to the lower tract. In three cases, the most serious, and found a mutation known to confer antiviral resistance. Is believed that at least one of which had acquired resistance after being treated.
This facility to mutate is potentially very dangerous. As conventional flu viruses cause mild disease, there is almost specific drugs, and the development of resistance to the existing two patients were unarmed. The result was that two died.
This feature, together with the ease of the pathogen to be transmitted in ferrets (the model used to predict what might happen in humans) have been very alarming were it not offset by other information: In May, Chinese authorities have only identified two cases, compared to 87 in April. It seems that the pathogen is on the wane. No clear explanation for this, but no longer, if confirmed, a relief.
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