Epidemiology of equine influenza in the Maghreb area.

The research study analyses the prevalence and impact of Equine Influenza (EI) – a highly infectious respiratory disease affecting horses, donkeys, and mules – in the Maghreb region which includes Algeria, Morocco, and Tunisia. The researchers reveal a longstanding presence of the EI virus (EIV) dating back to the 1970s, but adequate investigation or documentation of virus characteristics has been lacking, particularly in Tunisia. It emphasizes the need for improved surveillance of the disease in these countries.

Epidemiological Background

• The study examines EI, a debilitating respiratory illness caused by the EIV, which poses an excellent economic risk for industries reliant on equines.
• The geographical focus of the paper is the Maghreb area, comprising Algeria, Tunisia, and Morocco. Here, there is considerable serological evidence (indirect proof obtained by studying the serum of patients) of the EIV’s widespread circulation since the early ’70s.

Outbreak Investigation

• The research highlights a deficit in thorough investigations and documentation of EIV outbreaks, especially regarding isolating and characterizing the virus at a molecular level; something particularly observable in Tunisia.
• EIV isolates were successfully derived from Algerian outbreaks occurring in 1971/1972 and 2011, and Moroccan outbreaks in 1997 and 2004.

Evolution of Virus

• An interesting observation of ‘evolutionary stasis’ was noted in the EIV samples obtained from the 2004 Moroccan outbreak. In other words, sequences of the virus’s haemagglutinin (a protein that enables the virus to ‘bind’ to host cells) and non-structural protein 1 were seen to closely match those of viruses isolated in much earlier periods, suggesting a lack of substantial viral mutation or evolution over time.

Recommendations

• The study concludes by emphasizing the need for more robust surveillance of EIV in the Maghreb region. The potential for the virus’s re-emergence in these areas necessitates this course of action, crucial in mitigating its economic impacts and preventing further spread.