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Home Antimicrobial Resistance

Scarlet Fever Making a Comeback, This Time More Resistant

by Global Biodefense Staff
November 5, 2015
Streptococcus Pyogenes Bacteria

Pictomicrograph of Streptococcus pyogenes bacteria, which causes of puerperal fever and scarlet fever. Credit: CDC

An international study led by University of Queensland (UQ) researchers has tracked the re-emergence of a childhood disease which had largely disappeared over the past 100 years.

Researchers at UQ’s Australian Infectious Diseases Centre have used genome sequencing techniques to investigate a rise in the incidence of scarlet fever-causing bacteria and an increasing resistance to antibiotics.

Primarily affecting children under the age of 10, the illness is spread by Group A Streptococcus (strep throat bacteria) known as GAS. Symptoms include a red rash on the skin, sore throat, fever, headache and nausea.

“Over the past five years there have been more than 5000 cases in Hong Kong (a 10-fold increase) and more than 100,000 cases in China,” states Paul Walter, professor and researcher at the UQ School of Chemistry and Molecular Biosciences. “An outbreak in the UK has resulted in 12,000 cases since last year,” he said.

UQ School of Chemistry and Molecular Biosciences researcher Dr. Nouri Ben Zakour said the research results were deeply concerning. “We now have a situation which may change the nature of the disease and make it resistant to broad-spectrum treatments normally prescribed for respiratory tract infections, such as in scarlet fever.”

According to the researchers, the rise in scarlet fever could pre-empt a future rise in rheumatic heart disease, which causes permanent heart damage.

“With this heightened awareness, we can now swiftly identify scarlet fever-associated bacteria and antibiotic resistance elements, and track the spread of scarlet fever-causing GAS strains,” said Dr. Ben Zakour.

Currently, the evolutionary forces driving the outbreaks are unknown, but bacterial causes, the immune status of people contracting scarlet fever, and environmental factors such as temperature and rainfall could all play a significant role.

“Only a continued study of the patterns, causes and effects of health and diseases will determine the full impact these recent gene changes will have on the global GAS disease burden,” she said.

Read the study: Transfer of scarlet fever-associated elements into the group A Streptococcus M1T1 clone. Scientific Reports doi:10.1038/srep15877

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