Since Oct 24, 406 cases of the unidentified illness &ndash marked by fever, headache, cough, runny nose, and body aches &ndash have been reported to Dec 5 in the Panzi health zone in Congo&rsquo s southwest, the WHO said on Sunday (Dec 8). That&rsquo s up from 376 cases announced last week. While more than half of the cases involve children under 5, a 50-year-old male traveller hospitalised in Lucca, Italy, is suspected to have recovered from the disease, Il Tempo reported.

Thirty-one deaths have been recorded, down from 79 reported last week, according to the WHO. The outbreak is centred in a remote rural area of Kwango province, where poor road conditions and heavy rains mean it takes nearly 48 hours to reach from Kinshasa. The challenges of accessing the region have hampered efforts to confirm fatalities linked to the illness. All severe cases involve individuals suffering from severe malnutrition, adding complexity to identifying an infectious source.

These challenges, coupled with limited diagnostics in the region, have delayed the identification of the underlying cause,&rdquo the WHO said. &ldquo Teams are collecting samples for laboratory testing, providing a more detailed clinical characterisation of the detected cases, investigating the transmission dynamics, and actively searching for additional cases, both within health facilities and at the community level.&rdquo

Acute pneumonia, influenza, Covid-19, measles and malaria are considered as potential causal factors based on the signs and symptoms of those afflicted, the WHO said, adding that response teams are helping to treat patients and raise awareness of the outbreak within affected communities.

Malaria is common in the area, and it may be causing or contributing to the cases, the United Nations health agency said. &ldquo Laboratory tests are underway to determine the exact cause. At this stage, it is also possible that more than one disease is contributing to the cases and deaths.&rdquo BLOOMBERG