References
- 1. Disease data from ECDC Surveillance Atlas, Available from: https://ecdc.europa.eu/en/ surveillance-and-disease-data/atlas.
- 2. European Centre for Diseases Prevention and Control. Typhoid and paratyphoid fever for 2016, Stockhоlm: ECDC, 2018.
- 3. Heymann D L. Control of Communicable Diseases Manual (CCDM), the 18th revision, 2008.
- 4. Iliev B., Mitov G. Epidemiology of infectious and noninfectious diseases, Sofia, Med Fizkult, 1994.
