Today during the 2023 American Association for Clinical Chemistry Annual Scientific Meeting & Clinical Lab Expo, researchers presented new data on SARS-CoV-2 confections in the US, and showed among 26,000 samples, 1.33% of positive cases were also infected with another virus, including respiratory syncytial virus (RSV) or influenza.

"With changing behaviors as the COVID pandemic began to recede, we felt it was important to investigate the resurgence of other respiratory viruses and potential incidents of co-infection, especially with the additional circulation of SARS-CoV-2," said lead scientist George Pratt, PhD, at Quest Diagnostics in Marlborough, Mass., in a press release on the work.

Future winters will likely be defined by viral coinfections, the authors said. In the present study, researchers analyzed 26,657 respiratory tests from a clinical laboratory in the Northeastern US, all collected during a 107-day period in the fall of 2022. Included were 9,800 samples from pediatric patients under the age of 21. The scientists tested the samples for RSV, SARS-CoV-2, and influenza A/B.

Coinfection rates in the pediatric group were higher than in the adult population for all three viruses, the authors said. The highest coinfection rate was 6% for SARS-CoV-2 and influenza A in those under 21.

"As we experience more flu-seasons and future epidemics of respiratory viruses, we'll be able to acquire more co-infection rate data," Pratt said. "Our current work would make a useful data point to help evaluate whether future co-infection rates are shrinking or growing," he added.

Yesterday in Pediatrics researchers mined vaccine records of 16,365 US children ages 19 to 35 months in 2019 to determine how many complete the seven common multidose vaccine series given in infancy and early childhood. They found 1 in 6 US children had incomplete vaccine series.

Currently the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices recommends several vaccine series, each consisting of 1 to 4 doses, to protect against 15 diseases in the first 2 years of a child's life.

The present study surveyed a random sample of US caregivers who provided vaccine records for their children. The main outcome was uptake for the seven series of vaccines deemed most important for preventing childhood illness, which includes diphtheria, tetanus, and acellular pertussis (DTaP, 4 doses), pneumococcal conjugate vaccine (PCV, 4 doses), Haemophilus influenzae type b (Hib, 3–4 doses depending on brand), hepatitis B (HepB, 3 doses), polio (IPV, 3 doses), measles, mumps and rubella (MMR, 1 dose), and varicella (VAR, 1 dose) vaccines.

A total of 72.9% of children completed the entire vaccine series. Four out of seven of the vaccines had complete coverage 90% or greater, which is needed to confer herd immunity (IPV: 92.3%, MMR: 91.8%, HepB: 91.3%, and VAR: 90.9%). But DTaP, PCV, and Hib remained under target, at 83.3%, 82.5%, and 81.0% completion, respectively.

"Non-Hispanic White children, children whose families accessed care at private facilities, firstborn children, and children with private health insurance were more likely to have completed the combined 7-vaccine series," the authors wrote.

According to the authors, non-Hispanic Black children were at greater risk of not completing multidose series as compared with non-Hispanic White children (adjusted prevalence ratio [aPR]  1.28). And children from lower-income households and in rented homes were 25% to 30% more likely to fail to complete multidose vaccine series.

• Following Peru's emergency declaration earlier this month regarding a rise in Guillain-Barre syndrome (GBS) cases, the World Health Organization (WHO) today issued a risk assessment, which said more investigations are needed to determine the cause. Though the country typically registers fewer than 20 GBS cases a month, 130 suspected cases, 44 of them confirmed, were reported between June 10 and July 15. Peru experienced an unprecedented outbreak in 2019 that was linked to a specific Campylobacter jejuni genotype. Lab tests this year have confirmed the bacteria in 63% of 22 samples tested since the middle of June.
• In its latest mosquito-borne illness update, the Florida Department of Health (Florida Health) reported two more locally acquired dengue cases, raising the year's total to five. The state eliminated the virus in the 1930s and has often reported sporadic infections. Like the earlier cases, the two latest patients were both from Miami-Dade County. In other developments, Florida Health last week reported the first Eastern equine encephalitis (EEE) case of the year, which involved a patient from St Johns County, which is near St Augustine. Florida Health said the state typically records one or two human EEE cases each year.
• With sexually transmitted infections (STIs) on the rise in the wake of the COVID-19 pandemic, the WHO yesterday released new guidance updates to improve testing and diagnosis. It noted that challenges include new diseases such as mpox, alongside re-emerging ones and the spread of a Neisseria gonorrhoea isolate that is resistant to ceftriaxone. The guidance update includes target product profiles for point-of-care diagnostics for syphilis, Chlamydia, N gonorrhoea, and Trichomonas. A new edition of a lab manual now includes information on the use of molecular tests, rapid point-of-care tests, and quality management of diagnostic tests. It also unveiled a new publication on the diagnostics landscape to help meet the growing testing demands of low- and middle-income countries.