Expanded Analysis of 20 Pneumococcal Serotypes Associated with Radiographically Confirmed Community-acquired Pneumonia in Hospitalized US Adults

Raul Isturiz*, Lindsay Grant, Sharon Gray, Ronika Alexander-Parrish, Qin Jiang, Luis Jodar, Paula Peyrani, Kimbal D. Ford, Michael W. Pride, Wesley H. Self, Francis Counselman, Gregory Volturo, Luis Ostrosky-Zeichner, Richard G. Wunderink, Robert Sherwin, J. Scott Overcash, Thomas File, Julio Ramirez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Background: Streptococcus pneumoniae is a causative agent of community-acquired pneumonia (CAP). The 13-valent pneumococcal conjugate vaccine (PCV13) has significantly decreased the burden of PCV13-serotype pneumococcal disease; however, disease from nonvaccine serotypes remains substantial. A recent study documented the persistence of PCV13 serotypes among US adults hospitalized with radiographically confirmed CAP. The current analysis used a recently developed urinary antigen detection (UAD) assay (UAD2) to extend these results to additional serotypes included in an investigational PCV20 vaccine. Methods: This prospective study enrolled adults aged ≥18 years hospitalized with radiographically confirmed CAP between October 2013 and September 2016. Presence of S pneumoniae was determined by blood and respiratory sample culture, BinaxNOW urine testing, and UAD. In addition to Quellung on cultured isolates when available, serotypes were identified from urine specimens using UAD1 for PCV13 serotypes and UAD2 for 7 PCV20-unique serotypes (8, 10A, 11A, 12F, 15B, 22F, and 33F) and 4 additional serotypes (2, 9N, 17F, and 20). Results: Among 12 055 subjects with radiographically confirmed CAP, 1482 were positive for S pneumoniae. PCV13-and PCV20-unique serotypes were associated with 37.7% (n = 559) and 27.0% (n = 400) of cases, respectively; 288 subjects were exclusively diagnosed as positive for S pneumoniae by UAD2. Demographic and clinical disease characteristics were similar between subjects with CAP caused by PCV13 and PCV20-unique serotypes. Conclusions: The current analysis using UAD2 identified a sizeable proportion of hospitalized adult CAP associated with PCV20-unique serotypes. PCV20 may therefore address the burden of CAP caused by the additional serotypes present in the vaccine.

Original languageEnglish (US)
Pages (from-to)1216-1222
Number of pages7
JournalClinical Infectious Diseases
Issue number7
StatePublished - Oct 1 2021


  • 20-valent pneumococcal conjugate vaccine
  • Pneumonia
  • adult
  • serotypes
  • urinary antigen detection

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases


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