Management of Fever in Pregnancy

Diagnostic Approach

The Centers for Disease Control and Prevention recommends obtaining a detailed exposure history, including contact with livestock, sick contacts, travel history, and occupational exposures to guide empiric treatment decisions 1
The Centers for Disease Control and Prevention suggests assessing for specific infectious syndromes, such as Q fever, and performing chest radiography if respiratory symptoms are present 1

The Centers for Disease Control and Prevention recommends treating Q fever with trimethoprim-sulfamethoxazole 160mg/800mg twice daily throughout the remainder of pregnancy, which reduces adverse fetal outcomes from 81% to 40% and prevents progression to chronic Q fever 1, 2, 3

The American College of Obstetricians and Gynecologists recommends administering acetaminophen as first-line antipyretic for viral infections, as it is the only safe option during pregnancy and may provide protective effects against fever-related fetal harm 4

The Centers for Disease Control and Prevention recommends continuing trimethoprim-sulfamethoxazole with folic acid supplementation throughout pregnancy if Q fever is diagnosed, and performing serologic monitoring at 3, 6, 12, 18, and 24 months postpartum to detect progression to chronic disease 2, 3, 5
The American College of Obstetricians and Gynecologists suggests reassessing patients if symptoms persist beyond 10 days, and watching for development of high fever (>39°C) with purulent nasal discharge or facial pain lasting ≥3 consecutive days, suggesting bacterial sinusitis 4

A complete blood count is essential in the diagnostic workup of fever in pregnancy, as most acute infections show normal white blood cell counts 6
Liver function tests should be performed, as elevated transaminases occur in up to 85% of Q fever cases 6
Q fever serologic testing (Phase I and Phase II IgG and IgM antibodies) is recommended if there is any livestock exposure or unexplained fever 7, 8

Radiographic abnormalities appear in >96% of Q fever pneumonia cases, though early disease may show normal findings 7

Pregnant women with Q fever may be less symptomatic but remain at high risk for adverse pregnancy outcomes, including miscarriage, premature delivery, and intrauterine growth retardation 7, 8, 9
First trimester Q fever infection carries the highest risk for miscarriage and progression to chronic maternal disease 7, 8, 10
Second/third trimester infection is more likely to cause premature delivery rather than miscarriage 7, 8
At 18 weeks, untreated infection poses significant risk for premature delivery and intrauterine growth retardation 7, 8

Doxycycline should not be used in pregnancy due to its effects on fetal bone and teeth 11