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The infected Americans are health workers, ages 33 and 47, the latter of whom died.
Initial tests suggest the 5 new cases, including 4 deaths, are part of a known chain.
In Zika virus developments today, Brazil's health ministry reported 273 more suspected microcephaly cases and the World Health Organization (WHO) released interim guidance on lab testing for Zika infection.
Flu levels in Europe and North America continued to rise, with high but stable activity noted in northern Asia and China, the World Health Organization (WHO) said in a Mar 21 update.
The 2009 H1N1 virus is the predominant strain worldwide, though detections of influenza B have increased in Europe and northern Asia.
WHO head calls for a focus on building healthcare capacity, asks for more funds.
A MERS-CoV cluster in Buraydah, Saudi Arabia, has grown by 2 cases, 1 of which was fatal, to 28 since Mar 3, the Saudi Ministry of Health (MOH) reported today. The agency also noted that a previously reported patient in Buraydah died from his infection.
A fifth person has died from Ebola virus infection in southeast Guinea in recent days—raising fears of geographic spread—as the country monitors more than 800 possible contacts and Liberia closed its border with Guinea, Reuters reported in separate stories.
Flu showed widespread circulation in 40 states, and another 8 kids died from the virus.
Experts said only 2 of the new methods—Wolbachia and transgenic mosquitoes—were at the stage for carefully designed pilot projects.
A meta-analysis of 50 studies finds vaccine refusal common in measles, pertussis outbreaks.
Saudi Arabia reports 5 new MERS cases, 3 of them in Buraydah, and the WHO notes 6 cases.
Two cases of listeriosis that occurred in 2014 have been linked to raw milk produced by a Pennsylvania organic arm, the Centers for Disease Control and Prevention (CDC) said today.
Another fatal Ebola case has been reported in Guinea's recent Ebola cluster, involving a young girl who was hospitalized at an Ebola treatment center, Reuters reported on Mar 19, citing a spokesman for the country's Ebola coordination center.
In a development eerily similar to the last time, Guinea's government today confirmed 2 new cases, just hours after the WHO declared West Africa to be Ebola-free.
The approach could be used to screen other dengue vaccine candidates, as well as for Zika vaccines.
A gene study finds several changes in the circulating virus, though the clinical significance isn't clear.
The Northern Hemisphere's 2015-16 flu vaccine has shown significant protection against circulating 2009 H1N1 strains in Canada, according to an interim report today from Canadian researchers in Eurosurveillance.
Michigan health officials today announced a fatal Elizabethkingia anopheles bloodstream infection matching an ongoing outbreak in Wisconsin, according to a statement. The patient was an older adult with underlying health conditions from western Michigan, the Michigan Department of Health and Human Services (MDHHS) said.
One of today's new MERS-CoV cases is linked to a hospital outbreak in Buraydah, which it at 23 cases now.
Scientists unveiled risk estimates for 50 US cities, with hot spots in the South and East.
