Flu Scan for Sep 01, 2017

H1N2v case in Ohio
;
H7N9 death in China
;
Canine influenza

Second H1N2v flu case of 2017 reported in Ohio

The US Centers for Disease Control and Prevention (CDC) today confirmed a new case of variant H1N2 flu (H1N2v) in a child in Ohio, the second US case this year caused by that strain, and the 20th variant flu case of the year.

As with previous variant flu cases, the child had exposure to swine at a fair in the week before falling ill. He or she did not require hospital care and has fully recovered, the CDC said in its weekly FluView report. No human-to-human spread was detected. Ohio officials reported the case to the CDC last week.

The previous H1N2v case, also involving a child in Ohio with similar exposure, was reported by the CDC on Aug 4. H1N2v contains genes from swine flu strains plus the M gene from the 2009 H1N1 flu virus.

The CDC has also confirmed 18 H3N2v cases this year, 15 in Ohio and 1 each in North Dakota, Ohio, and Texas.

The agency said in today's update, "Early identification and investigation of human infections with novel influenza A viruses are critical to ensure timely risk assessment and so that appropriate public health measures can be taken."
Sep 1 CDC update

 

China reports fatal H7N9 avian flu case

China has reported another H7N9 avian flu infection, which involves a 58-year-old man from Jiangsu province in the eastern part of the country, according to a statement today from Hong Kong's Center for Health Protection (CHP).

Investigators found that the man, who died from his illness, was likely exposed to the virus at a live-poultry market.

The fifth and by far the largest H7N9 wave in China began last October and has largely tapered off in the summer months, but the country continues to report sporadic human cases as well as outbreaks in poultry.

The new case lifts the total in the fifth H7N9 wave to 756 cases, based on a weekly avian flu update posted by the CHP on Aug 29. At least 247 deaths have been reported.
Sep 1 CHP report

 

Study: Single introduction of canine flu in Chicago caused 2015 outbreak

Researchers describe the 2015 introduction of H3N2 canine influenza virus (CIV) from South Korea to the United States today in Emerging Infectious Diseases.

Though canine influenza has been circulating in China since 2006, the disease was limited to outbreaks in Asian countries. In February of 2015, dogs in Chicago shelters and training schools began showing symptoms of H3N2, including cough and moderate respiratory distress.

Within 2 months, the virus spread to neighboring states. By April, scientists at the University of Wisconsin-Madison performed genetic analyses of the virus, finding it identical to a circulating strain of H3N2 from South Korea.

Further testing showed the strain capable of viral shedding for up to 3 weeks, prompting researchers to conclude that likely introduction of the disease was through an animal, and not fomites (which can transmit live H3N2 virus for only up to 48 hours). Thus, they hypothesized the disease was brought to America through dogs rescued from South Korean meat markets, where up to 19% of dogs are infected with H3N2.

"Hundreds of dogs rescued from meat markets in South Korea have been rehomed in the United States since the beginning of 2015, although no direct link between any of these dogs and the appearance of H3N2 CIV in the United States has been established," the authors write.
Sep 1 Emerg Infect Dis
study

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