T. A. Savitskaya
Kazan Research Institute of Epidemiology and Microbiology, Kazan
Russian Federation

67, Bolshaya Krasnaya St., Kazan, 420015

V. P. Popov
Plague Control Center, Moscow
Russian Federation

4, Musorgskogo St., Moscow, 127490, Russian Federation

V. A. Trifonov
Kazan Research Institute of Epidemiology and Microbiology, Kazan; Kazan State Medical Academy – Affiliated Branch of the Federal State-Funded Educational Institution for Further Vocational Education “Russian Medical Academy of Continuing Professional Education”, Ministry of Health of the Russian Federation, Kazan
Russian Federation

Kazan Research Institute of Epidemiology and Microbiology, 67, Bolshaya Krasnaya St., Kazan, 420015, Russian Federation.

Kazan medical Academy, 36, Butlerova St., Kazan, 420015, Russian Federation. 

I. V. Milova
Center of Hygiene and Epidemiology in the Republic of Tatarstan, Kazan
Russian Federation

13a, Sechenova St., Kazan, 420061, Russian Federation. 

G. Sh. Isaeva
Kazan Research Institute of Epidemiology and Microbiology, Kazan; Kazan State Medical University of the Ministry of Health of the Russian Federation, Kazan
Russian Federation

Kazan Research Institute of Epidemiology and Microbiology, 67, Bolshaya Krasnaya St., Kazan, 420015, Russian Federation. 
Kazan State Medical University, 49, Butlerova St., Kazan, 420012, Russian Federation

I. D. Reshetnikova
Kazan Research Institute of Epidemiology and Microbiology, Kazan; Kazan (Privolzhsky) Federal University, Kazan
Russian Federation

Kazan Research Institute of Epidemiology and Microbiology, 67, Bolshaya Krasnaya St., Kazan, 420015, Russian Federation.

Kazan (Privolzhsky) Federal University, 18, Kremlevskaya St., Kazan, 420008, Russian Federation.