Mycoplasma Pneumonia: Likelihood Ratios

Introduction: Mycoplasma is one of the causes of an atypical Community Acquired Pneumonia.

Prevalence

The likelihood ratios of findings for Mycoplasma Pneumonia are listed below. See the left navigation bar to change the display.

Good Positive Likelihood Ratio

inf

0.6

sensitivity ~20% in young adults and 9% in children

sensitivity 50% in first 3 weeks of infection

Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586

2.2

0.7

much more sensitive (90-100%) but less specific in young adults / children

sensitivity 76% in first 3 weeks rising to 100% by 2 months in all comers

Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586

Poorly Diagnostic Findings

1.9

0.8

sensitivity higher and specificity lower in young adults / children

sensitivity 33% in first 3 weeks up to 76% at 2 months in all comers

Study: Clin Infect Dis. 2009 May 1;48(9):1244-9. PMID 19331586

Sensitivity = 50%

IgM antibodies; develop 1-2 weeks after infection

Study: Clin Infect Dis 1993 Aug;17 Suppl 1:S79-82. PMID 8399943