Streptococcus pneumoniae colonization associates with impaired adaptive immune responses against SARS-CoV-2.

Elena Mitsi, Jesus Reine Gutierrez, Britta Urban, Carla Solórzano, Elissavet Nikolaou, Angela D. Hyder-Wright, Sherin Pojar, Ashleigh Howard, Lisa Hitchins, Sharon Glynn, Madi Farrar, Kostas Liatsikos, Andrea Collins, Naomi Walker, Helen Hill, Esther German, Katerina Cheliotis, Rachel Byrne, Chris Williams, Ana I. Cubas-AtienzarTom Fletcher, Emily Adams, Simon J. Draper, David Pulido, Rohini Beavon, Christian Theilacker, Elizabeth Begier, Luis Jodar, Bradford D. Gessner, Daniela Ferreira

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

BACKGROUND

Although recent epidemiological data suggest that pneumococci may contribute to the risk of SARS-CoV-2 disease, cases of co-infection with Streptococcus pneumoniae in COVID-19 patients during hospitalisation have been reported infrequently. This apparent contradiction may be explained by interactions of SARS-CoV-2 and pneumococcus in the upper airway, resulting in the escape of SARS-CoV-2 from protective host immune responses.

METHODS

Here, we investigated the relationship of these two respiratory pathogens in two distinct cohorts of a) healthcare workers with asymptomatic or mildly symptomatic SARS-CoV-2 infection identified by systematic screening and b) patients with moderate to severe disease who presented to hospital. We assessed the effect of co-infection on host antibody, cellular and inflammatory responses to the virus.

RESULTS

In both cohorts, pneumococcal colonisation was associated with diminished anti-viral immune responses, which affected primarily mucosal IgA levels among individuals with mild or asymptomatic infection and cellular memory responses in infected patients.

CONCLUSION

Our findings suggest that S. pneumoniae impairs host immunity to SARS-CoV-2 and raises the question if pneumococcal carriage also enables immune escape of other respiratory viruses and facilitates reinfection occurrence.

TRIALS REGISTRATION

ISRCTN89159899 for FASTER study and Clinicaltrials.gov identifier: NCT03502291 for LAIV study.

Original languageEnglish
Article numbere157124
Pages (from-to)e157124
JournalJournal of Clinical Investigation
Volume132
Issue number7
DOIs
Publication statusPublished - 1 Apr 2022

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