Irkutsk Oblast

Irkutsk Oblast is a federal region of Russia in south-eastern Siberia. The city of Irkutsk houses the oblast's regional administration. The names Irkutskaya Oblast and Иркутская область also refer to the region. References to Irkutsk can therefore mean either the city or the wider federal region.

The oblast contains specialist public-health institutions, including the Irkutsk Anti-Plague Institute. When an unusual illness involves such a facility, regional authorities report through Russia's International Health Regulations focal point while WHO may seek verification. A report tied to the institute does not by itself establish an outbreak across Irkutsk Oblast. The geographic distinction matters because the region is far larger than its administrative centre or any single laboratory.