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Study Shows COVID-Infected Mothers’ Breastmilk Provides Infants with Antibodies

January 05, 2022

MOSCOW, Idaho — Jan. 4, 2022 — Mothers who breastfeed provide antibodies to their infants that can provide natural protection against the coronavirus that causes COVID-19, a team of researchers reported.

The new report expands earlier findings that showed the milk of breastfeeding women infected with SARS-CoV-2 did not contain the virus.

Their results support recommendations encouraging lactating women to continue breastfeeding during and after COVID-19 illness, the researchers said.

The expanded study included more than 60 women who provided samples up to two months after their COVID-19 diagnoses, said Michelle K. “Shelley” McGuire of the University of Idaho. She led the study with University of Rochester Medical Center colleague Antti E. Seppo.

The team included researchers from the U of I; Washington State University; University of Rochester Medical Center; University of California, San Francisco; Brigham and Women’s Hospital; University of Arkansas for Medical Sciences; and Tulane University. The journal Frontiers in Immunology published their report Dec. 23.

“What was really important was those antibodies remained elevated in most of those women for up to two months,” McGuire said. “It just added confidence that even if you have COVID, breastfeeding is the right thing to do.”

The team tested the breastmilk samples for immunoglobulin A antibodies specific to the spike protein in the novel coronavirus responsible for the pandemic.

The tests showed three-quarters of the women continued to produce the antibodies in breastmilk for up to two months with some beginning as early as within a week of their COVID-19 diagnosis.

The researchers said the antibodies in breastmilk likely provided the women’s infants with a lasting source of passive immunity.

The women also submitted swabs from breast skin before and after washing. Although no SARS CoV-2 virus was detected in milk, 29% of skin swabs tested positive for SARS CoV-2 genetic material (RNA) before washing. Only two of 29 swabs, 6%, tested positive after washing. The researchers attributed the presence of the viral RNA to coughing by the women or household sources.

The researchers stressed that they found no evidence of live virus or reason to be concerned about this finding. The bottom line stayed the same: Breastfeeding during COVID-19 is not only safe for infants, it is likely protective, McGuire said.

Media Contacts

Shelley McGuire
Director, Margaret Ritchie School of Family and Consumer Sciences
University of Idaho
208-885-6698
smcguire@uidaho.edu

Bill Loftus
College of Agricultural and Life Sciences
University of Idaho
208-885-7694
bloftus@uidaho.edu

About the University of Idaho

The University of Idaho, home of the Vandals, is Idaho’s land-grant, national research university. From its residential campus in Moscow, U of I serves the state of Idaho through educational centers in Boise, Coeur d’Alene and Idaho Falls, nine research and Extension centers, plus Extension offices in 42 counties. Home to nearly 11,000 students statewide, U of I is a leader in student-centered learning and excels at interdisciplinary research, service to businesses and communities, and in advancing diversity, citizenship and global outreach. U of I competes in the Big Sky and Western Athletic conferences. Learn more at uidaho.edu


Contact

University Communications and Marketing

Fax: 208-885-5841

Email: uinews@uidaho.edu

Web: Communications and Marketing

U of I Media Contacts