News Scan for Apr 16, 2018

MERS superspreader
;
Measles spike in Europe
;
Avian flu in Bangladesh, Hong Kong
;
Artificial antimicrobial peptide

MERS superspreader study highlights risk in cardiac, renal patients

Difficulty distinguishing pneumonia from volume overload in a patient with renal failure delayed a MERS-CoV diagnosis at a Riyadh hospital last year, which led to a superspreading event that sickened 44 people at three health facilities, Saudi researchers reported in the American Journal of Infection Control.

In their detailed report on the outbreak and its spread, the group said the lessons they learned could help fine-tune protocols for screening for the MERS-CoV (Middle East respiratory syndrome coronavirus) in emergency departments (EDs).

The index patient was a 46-year-old Yemeni man with underlying health conditions including diabetes, hypertension, and asthma, who came into the ED at Riyadh's King Saud Medical City with respiratory symptoms without fever and a recent history of diarrhea. His chest radiograph suggested pulmonary edema, and his blood tests showed evidence of acute kidney failure that required urgent dialysis.

After two dialysis sessions, his pulmonary edema improved, but his respiratory symptoms didn't. He spent 14 hours in the crowded multibed ED before he was admitted to an inpatient room, which he shared with four other patients. Two days later, he experienced respiratory distress, requiring intubation and admission to the intensive care unit, where samples were obtained that tested positive for MERS-CoV. He was taken to another hospital in Riyadh that serves as the MERS-CoV regional reference center, where he died 22 days after admission.

An investigation at the first hospital identified 120 contacts, 109 of them health workers, who had direct unprotected exposure to the man. Sixteen people tested positive for MERS-CoV, including 5 nurses, 3 physicians, 1 paramedic, and 7 patients, 1 of which was a patient at the second hospital. The eventual total for the three simultaneous hospital clusters was 44 cases, 11 of them fatal.

The group concluded that problems identifying pneumonia in people with renal and cardiac failure can delay suspicion for MERS-CoV, along with delays in proper infection control steps. They said the report confirmed the need to rule out the disease in such patients and that a rapid point-of-care test is urgently needed to help ED triage teams identify the disease sooner and prevent major outbreaks.
Apr 13 Am J Infect Control abstract

 

ECDC reports measles spike in the last month across Europe

The European Centre for Disease Prevention and Control (ECDC) late last week reported a spike in measles activity throughout Europe in the last month. So far, the ECDC has recorded 13 deaths from the disease in 2018.

Romania, with 1,709 cases so far this year, has been hit the hardest, followed by Greece (1,463), France (1,346), and Italy (411). Most concerning are the case counts in France and Italy, which have almost tripled and more than doubled, respectively, in the last month, the ECDC said.

From Mar 1, 2017, to Feb 28, 2018, the ECDC recorded 14,813 measles cases. "Of these cases where age was known, 35% were in children under five and 47% were in those 15 and older. Where vaccination status was known, 86% were unvaccinated," the ECDC said.

According to the most recent health data collected by the World Health Organization in 2016, measles vaccination coverage was below 95% in 22 out of 29 European Union countries surveyed. A 95% population coverage rate with two doses of vaccine is needed to prevent transmission of the measles virus.
Apr 13 ECDC update

 

H5N1 strikes Bangladeshi poultry; H5N6 hits Hong Kong pet bird store

In the latest highly pathogenic avian flu outbreak developments, Bangladesh reported an H5N1 event involving poultry, and Hong Kong reported evidence of H5N6 at a pet bird shop.

The outbreak in Bangladesh is the country's second to be reported in 2018, according to a recent notification from the World Organization for Animal Health (OIE). The latest detection occurred in layers at a farm at a military boarding school on the outskirts of Jhenaidah in the southwestern part of the country. With a Mar 21 start date, the outbreak killed all 385 of the birds, and authorities destroyed 319 eggs. So far the source of the virus hasn't been determined.

Hong Kong today said in a separate OIE report today that a sample collected Apr 7 from a bird cage holding mynas at a pet bird shop tested positive for the H5N6 virus. The sample was taken as part of routine avian flu surveillance for all poultry farms, poultry markets, and pet bird shops.

A total of 2,834 pet birds were removed from the shop and culled on Apr 13, and the store will be closed for 21 days as part of steps to control the spread of the virus. The source of the virus isn't known, and the report added that no wetlands, nature reserves, or poultry farms are located within 3 kilometers of the store.
Apr 13 OIE report on H5N1 in Bangladesh
Apr 16 OIE report on H5N6 in Hong Kong

 

Algorithm helps identify antimicrobial peptide with therapeutic potential

An international team of scientists reports today on the use of a computational approach to develop an artificial antimicrobial peptide with the potential to treat gram-negative bacteria.

In a paper published in Nature Communications, researchers from the Massachusetts Institute of Technology (MIT) and the Catholic University of Brasilia describe their approach, which relies on a computer algorithm to generate and evaluate antimicrobial peptide sequences with the greatest potential for antimicrobial activity. Using as a template the plant peptide Pg-AMP1—which is found in the seeds of the guava plant but has only weak antimicrobial activity—the scientists generated 100 candidates and then synthesized them to test against bacteria grown in the lab.

The most promising of these candidates was guavinin 2, which was highly active against Escherichia coli and Acinetobacter baumannii, with limited activity against Klebsiella pneumoniae and modest killing activity toward gram-positive bacteria. When tested in mice with a skin infection caused by Pseudomonas aeruginosa, guavanin 2 significantly reduced the bacterial count.

The scientists say they will continue developing guavanin 2 for use in humans and will use the algorithm to seek out other antimicrobial peptides.

"We can use computers to do a lot of the work for us, as a discovery tool of new antimicrobial peptide sequences," study co-author Cesar de la Fuente-Nunez, PhD, said in an MIT press release. "This computational approach is much more cost-effective and much more time-effective."
Apr 16 Nat Commun study
Apr 16 MIT press release

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