News Scan for Jul 18, 2018

California infant pertussis death
;
PPE doffing and contamination risk
;
Avian flu outbreaks in poultry
;
Sex differences and flu

California reports infant pertussis death

The California Department of Public Health (CDPH) yesterday announced that a baby from San Bernardino County has died from pertussis, marking the state's first death from the disease since 2016.

Karen Smith, MD, MPH, CDPH director and state public health officer, said in a press release that the baby's death is a tragedy for the family and for the state, since pertussis is a preventable disease. "This serves as a grim reminder that whooping cough is always present in our communities, and immunizations are the first line of defense."

In 2010, a large pertussis outbreak in California—its biggest since 1947—resulted in 986 cases in children and 10 related deaths in kids younger than 3. Babies can't begin vaccination against the disease until they are 2 months old, so public health officials depend on vaccination in pregnant women and infant contacts to protect the youngest, vulnerable population.

Provisional surveillance totals for 2017 from the US Centers for Disease Control and Prevention (CDC) show that nationally there were 13 pertussis deaths that year, 4 of them in children younger than 1 year.

Smith said no babies should have to be hospitalized due to vaccine-preventable disease, and certainly no baby should die. "I urge all pregnant women to get vaccinated against whooping cough as early as possible during the third trimester of every pregnancy," she said. The CDPH also recommends that parents immunize their babies as soon as possible, that 7th-grade students receive a whooping cough booster (tetanus, diphtheria, and acellular pertussis vaccine [Tdap]), and that adults receive a booster once in their lives.
Jul 17 CDPH news release
CDC provisional pertussis surveillance for 2017

 

Researchers detail contamination risk during PPE doffing

Researchers who tested 10 different personal protective equipment (PPE) protocols for protecting healthcare workers from Ebola virus found a higher risk of self-contamination with doffing and fewer problems with PPE sequences involving powered air-purifying respirators (PAPRs) and assisted doffing. A team from University of New South Wales in Australia reported their findings yesterday in the American Journal of Infection Control.

Ten participants were randomly assigned to use three different PPE protocols. The 10 protocols tested were from the World Health Organization, the CDC, the European Centre for Disease Prevention and Control, Health Canada, North Carolina, New South Wales, and Doctors Without Borders. To simulate Ebola contamination, researchers applied fluorescent lotion and spray to the PPE surface. Then to assess self-contamination, they used ultraviolet light to count fluorescent patches on the skin.

Large fluorescent patches were recorded after two sequences using coveralls, and small patches were detected after another coverall protocol and one involving gowns. Problems that were commonly reported included breathing difficulty, suffocation, heat stress, and fogged-up glasses. Most participants rated the PPE protocols high or medium for ease of donning and doffing, and those with PAPRs and assisted doffing were linked to fewer problems and had the highest ratings.

The team said the risk of self-contamination with gowns may be lower than coveralls, but they said gowns may not fully protect the body, and larger studies are needed to confirm the findings. They concluded that the study confirms the risk of self-contamination with PPE doffing and that protocols containing PAPR and assisted doffing should be preferred whenever possible during outbreaks of highly infectious pathogens.
Jul 17 Am J Infect Control abstract

 

High-path H5 avian flu outbreaks strike poultry in Ghana, Russia

In the latest highly pathogenic avian influenza outbreak developments, Ghana reported an H5 outbreak at a farm, its first since the end of 2016, and Russia reported more H5 outbreaks, part of ongoing activity since June, according to the latest reports from the World Organization for Animal Health (OIE).

In Ghana, the outbreak began on Jun 27 at a farm in Ashanti region in the south central part of the country, killing 2,033 of 6,451 susceptible birds. The survivors were culled to control the spread of the virus. An investigation found that the outbreak may be linked to an illegal movement of infected birds.

Elsewhere, Russia today reported 13 more H5 outbreaks from the western part of the country. The OIE report doesn't list a subtype, but a report last week from the United Kingdom said the Russian outbreaks involve H5N8.

Three of the outbreaks involved farms, and 10 were detected in backyard poultry. The events began between Jul 3 and Jul 15, killing 8,873 of 300,505 birds. Affected districts include Rostov, Republic of Tatarstan, Chuvashia Republic, and Nizhny Novgorod.
Jul 17 OIE report on H5 in Ghana
Jul 18 OIE report on H5 in Russia

 

Male mice may clear flu faster because of rapid lung healing

A new study showed that male mice may recover more quickly than their female counterparts from influenza infections because they produce more amphiregulin, a growth factor protein important in wound healing. The research was published in Biology of Sex Differences yesterday.

Researchers from Johns Hopkins Bloomberg School of Public Health conducted the study, which involved infecting live mice and human epithelial cells with a strain of 2009 H1N1 influenza virus. Female mice showed greater clinical disease than male mice, including pulmonary inflammation.

Expression of amphiregulin was greater in the lungs of male mice, as well as in primary respiratory epithelial cells derived from mice and a human male donors, than it was in females.

"The novel finding here is that females also have slower tissue-repair during recovery, due to relatively low production of amphiregulin," says senior study author Sabra Klein, PhD, an associate professor in the Department of Molecular Microbiology and Immunology at the Bloomberg School, in a John Hopkins press release.

The researchers said further study is needed to determine how amphiregulin is affected by testosterone, estrogen, and progesterone.
Jul 17 Biol Sex Differ study
Jul 17 Johns Hopkins University press release

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