Italy has officially recorded its first imported human case of avian influenza A(H9N2), a significant development confirmed by the World Health Organization (WHO). This marks not only Italy’s inaugural case but also the first imported human H9N2 infection within the entirety of the WHO’s European Region, underscoring the global reach of zoonotic diseases.
A Transcontinental Journey and Timely Diagnosis
The patient, an adult man, arrived in Italy in mid-March after residing in Senegal for over six months. Shortly after his arrival, he sought emergency medical attention, presenting with a fever and a persistent cough. On March 16, a bronchoalveolar lavage sample yielded a dual diagnosis: positive for Mycobacterium tuberculosis and an unsubtypeable influenza A virus.
Swift action followed, with the patient immediately placed in a negative-pressure isolation room under airborne precautions. Treatment commenced with a combination of antitubercular drugs and the antiviral oseltamivir. Further laboratory analysis by a regional reference facility on March 20 identified the A(H9) subtype, which was definitively confirmed as influenza A(H9N2) through next-generation sequencing just one day later.
Tracing the Viral Origin
Italy’s National Influenza Center conducted additional characterization, revealing that the detected virus strain bore a close genetic resemblance to those previously found in poultry populations in Senegal. This crucial link strongly suggests that the infection was likely acquired from an avian source in the West African nation.
Despite the clear epidemiological connection, health authorities reported that the man denied any known exposure to poultry, wildlife, or rural environments, nor did he have contact with individuals exhibiting similar symptoms prior to his illness. The precise source of exposure remains under active investigation.
Vigilant Containment and Global Monitoring
In response to the confirmed case, officials initiated comprehensive contact tracing efforts in both Senegal and Italy. All identified contacts in Senegal have remained asymptomatic, while those in Italy tested negative for influenza. These Italian contacts completed active monitoring and quarantine protocols in line with national guidelines and received oseltamivir as a precautionary measure.
By April 9, the patient’s condition was reported as stable and improving, a positive outcome attributed to the prompt medical intervention. The WHO emphasizes the critical importance of reporting human infections caused by novel influenza A virus subtypes due to their potential public health implications. However, based on the current evidence, the organization has assessed the risk posed by A(H9N2) viruses to the general population as low, while maintaining continuous global surveillance of the situation.
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