Weekly Disease Report

This page is a weekly report of reportable diseases in Hamilton County, TN. If you have any questions, please call our Epidemiology Department at (423) 209-8190.

A "reportable" disease is one that is required to be reported to the Health Department. Generally, these are diseases that are infectious from person-to-person or from some agent in the environment to people (for example, mosquitoes or ticks). Tracking these diseases provides an early warning system for the population as a whole. An "outbreak" is a cluster of cases of a disease. Monitoring "reportable" diseases allows us to determine when an "outbreak" is occurring.

Influenza (the flu) is not a reportable disease, however, each flu season (October to May) we track flu-like symptoms that are reported to us by local healthcare providers. These reports are on a voluntary basis but give us some idea of the severity of a flu season in our local area. These numbers will not appear on this report, but rather, will appear on a separate influenza report. For more information on influenza and the importance of getting the flu vaccine, visit our Influenza page.

These abbreviations apply to the table below:
MMWR = Morbidity and Mortality Weekly Report
WK = Week (calendar week number begin January 1)
YTD = Year-to-Date
- % change = means fewer than this time last year

Reportable Diseases

Hamilton County Selected Reportable Diseases, Year-to-Date (MMWR 45), Reporting Period: 12/30/18 - 11/9/19 Hamilton County 2018 YTD* Hamilton County 2019 YTD* Percent Change State of TN 2019 YTD* 
Botulism, infant 0 0 0% 2
Campylobacteriosis 23 31 35% 806
Chikungunya Virus 0 0 0% 3
Chlamydia 1,901 2,168 14% 34,908
Cryptosporidiosis 9 6 -33% 201
Dengue Fever 0 0 0% 7
Ehrlichiosis/Anaplasmosis 4 8 100% 128
Enterobacteriaciae, Carbapenem-resistant (CRE) 6 13 117% 486
Gonorrhea 860 985 15% 13,507
Group A Streptococcus, invasive 15 18 20% 352
Group B Streptococcus, invasive 25 31 24% 522
Haemophilus influenzae, invasive 4 7 75% 156
Hansen disease (Leprosy) 0 0 0% 0
Hemolytic uremic syndrome 2 0 -100% 13
Hepatitis A, acute 41 191 366% 1,983
Hepatitis B, acute 4 5 25% 278
Hepatitis C Virus Infection, chronic, or resolved 895 738 -18% 14,311
Hepatitis C, acute 1 34 3300% 480
HIV 21 41 95% 655
Latent Tuberculosis Infection 63 49 -22% 913
Legionellosis 6 4 -33% 134
Listeriosis 1 3 200% 22
Lyme disease 0 1 Undefined 42
Malaria 0 0 0% 12
Mumps 0 0 0% 38
Neisseria meningitidis, invasive 0 2 Undefined 6
Pertussis 5 7 40% 161
Salmonellosis 39 35 -10% 994
STEC (Shiga toxin-producing Escherichia coli)  8 13 63% 341
Shigellosis 6 4 -33% 149
Spotted Fever Rickettsiosis 13 3 -77% 323
Syphilis 61 69 13% 1,641
Streptococcus pneumoniae, invasive disease (IPD) 27 19 -30% 609
Tuberculosis 3 7 133% 108
VRE (Vancomycin-Resistant Enterococcus), invasive 6 8 33% 133
Vibriosis 1 0 -100% 33
West Nile Virus, neuroinvasive disease 1 0 -100% 3
West Nile Virus, non-neuroinvasive disease 2 0 -100% 0
Yersiniosis 0 0 0% 0
Zika 0 0 0% 0
*Preliminary data subject to change - source: TN Dept of Health
ǂ“Acute Hepatitis C case counts are higher in 2018-2019 than in past years in part due to increased hepatitis testing related to the Hepatitis A outbreak and strict application of the Hepatitis C case definition”