Bacterium

For Rocky Mountain Spotted Fever (RMSF), the overall mortality rate is 4%, despite effective antibiotic therapy (Medscape)

The overall mortality rate for E. coli O157:H7 is <1%. For those who develop hemolytic uremic syndrome, the death rate is between 3-5% (www.azdhs.gov)

The estimated case fatality rate is < 2% of hospitalized patients (wikipedia)

The standardized mortality ratio for cases infected domestically was 2.9 (95% CI: 1.9–4.0) within the first month following the illness (Ternhag et al, 2005)

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This bacterium infects multiple types of hosts including herbivorous mammals such as livestock and is considered zoonotic however humans are a dead end host and do not become infectious.