Clostridioides (formerly Clostridium) difficile infection (CDI) is the most common infectious cause of healthcare-associated diarrhea in adults. Guidelines on management of CDI have recently been updated.

This article includes recommendations for management of most sexually transmitted infections (STIs) other than HIV and viral hepatitis. Some of the indications and dosages recommended here have not been approved by the FDA (see Table 1).

About 2.5 million persons in the US had hepatitis C between 2017 and 2020. Guidelines from the American Association for the Study of Liver Diseases (AASLD) and the Infectious Diseases Society of America (IDSA) on management of hepatitis C virus (HCV) infection were updated in 2023.

The CDC has issued new recommendations for treatment of gonococcal infection. A single 500-mg IM dose (1000 mg in patients weighing ≥150 kg) of the third-generation cephalosporin ceftriaxone is now the treatment of choice for patients with uncomplicated urogenital, rectal, or pharyngeal gonorrhea.

Most respiratory tract infections are caused by viruses. Bacterial respiratory tract infections are usually treated empirically with antibiotic therapy that targets the most probable causative pathogens. Recommended antibiotic regimens for outpatient treatment of some common respiratory tract infections are listed in Table 1 for adults and Table 2 for children.

The FDA has approved rezafungin (Rezzayo – Cidara/Melinta), an intravenous echinocandin antifungal, for once-weekly treatment of candidemia and invasive candidiasis (IC) in adults with limited or no alternative options. It is the first new drug to become available in the US in more than 15 years for treatment of systemic Candida infections.

Maribavir (Livtencity – Takeda), an oral cytomegalovirus (CMV) pUL97 kinase inhibitor, has been approved by the FDA for treatment of post-transplant CMV infection refractory to standard antiviral therapy in patients ≥12 years old who weigh at least 35 kg.

The FDA has approved Cabenuva (ViiV Healthcare), an extended-release formulation of the new integrase strand transfer inhibitor (INSTI) cabotegravir copackaged with an extended-release formulation of the non-nucleoside reverse transcriptase inhibitor (NNRTI) rilpivirine, as a once-monthly complete regimen for intramuscular (IM) treatment of adults with HIV-1 infection who are virologically suppressed (HIV-1 RNA...

The FDA has approved a fixed-dose combination of omeprazole, amoxicillin, and rifabutin (Talicia – RedHill) for treatment of Helicobacter pylori infection in adults. Talicia is the first rifabutin-based product to be approved for this indication.

The FDA has approved Exblifep (Allecra), a fixed-dose combination of the cephalosporin cefepime and the beta-lactamase inhibitor enmetazobactam, for IV treatment of adults with complicated urinary tract infections (cUTIs), including pyelonephritis, caused by designated susceptible microorganisms (see Spectrum of Activity). Exblifep is the first product that contains enmetazobactam to be approved in the US.