Health authorities are monitoring a Cape Town wastewater treatment plant after routine testing detected traces of two different polio-related virus strains, prompting intensified surveillance measures, even as officials stress there is no outbreak and no confirmed human case linked to the findings, Cape {town}Etc reports.
In an update issued yesterday, the Department of Health confirmed that the virus strains were identified during ongoing environmental monitoring conducted by the National Institute for Communicable Diseases (NICD), part of broader efforts to track emerging public health risks before clinical infections surface.
Officials said the detections involved vaccine-derived poliovirus strains known as VDPV3 and nOPV2-L. Importantly, the findings were made through wastewater sampling and not through testing of any individual patient.
Health experts have described the detections as ‘vaccine events’, meaning no active cases of polio have been diagnosed in humans.
South Africa was declared polio-free by the World Health Organization’s African Regional Certification Commission in 2019, and authorities maintain that status has not changed.
The latest detection is believed to be linked to imported cases involving individuals vaccinated outside South Africa with different oral polio vaccines than those used locally.
Disease surveillance teams are increasing the frequency of wastewater sampling and strengthening monitoring systems as part of precautionary public health measures.
The use of wastewater surveillance has become an increasingly important tool globally in recent years, particularly after the Covid-19 pandemic highlighted how sewage monitoring can detect viruses circulating in communities before widespread illness is reported.
Officials have urged residents not to panic, but encouraged the public to remain alert to possible symptoms associated with polio-related illness and to seek medical advice if concerns arise.
Symptoms may include muscle weakness, joint pain, fatigue, muscle wasting and breathing or swallowing difficulties, although health professionals cautioned that many of these symptoms are also linked to other medical conditions.
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