It's unknown when supplies of the Pfizer's penicillin G drug will be replenished.
Investigators say the dose of linezolid may have been too low and the duration of treatment too short.
Investigators say the results of the randomized trial likely reflect low adherence among participants assigned to receive doxycycline postexposure prophylaxis.
Providers who more commonly treat STIs were more likely to prescribe prophylactic doxycycline for STI prevention and agree that the benefits outweigh the risks.
New surveillance reports show rising rates of gonorrhea, chlamydia, and syphilis after a brief dip during the COVID-19 pandemic.
Doxycycline post-exposure prophylaxis, or doxy-PEP, could help slow rising rates of chlamydia, syphilis, and gonorrhea, but experts say antibiotic resistance will need to be monitored.
Researchers say the case suggests an unidentified Treponema pallidum strain tied to higher risk for systemic involvement.
The FDA said the test offers a private and quick testing option, along with streamlined treatment, if needed.
Most of the newly affected Finnish farms raised foxes, but some also produced raccoon dogs.
Officials said a key step would be offering syphilis screening in nontraditional settings such as emergency departments, jail intake, and maternal-child health programs.