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Does Breastmilk Neutralize HIV?

Written by Diana Cassar-Uhl, IBCLC

Photo by DFID – UK Department for International Development via Flickr

As an IBCLC, I’m always thrilled when a new study comes out and affirms what I already know about human milk – that it’s amazing and we’re constantly learning something new about it.

Last summer, one of the first classes I took toward my Master of Public Health was Introduction to Epidemiology. Because it was online, class discussions were held to a strict standard – our professor required us to back up any claims with peer-reviewed evidence.  No matter what the topic was, I did my best to bring it around to breastfeeding, often to the chagrin of the other rising students of public health, who learned quickly just how much they didn’t know about breastfeeding. Naturally, no class about epidemiology (according to Merriam-Webster: the study of the incidence, distribution, and control of diseases in a population) would be complete without discussions of HIV, but the topic of HIV and breastfeeding wasn’t one I ever needed more than an elementary understanding about, given the population I serve as an IBCLC.

A classmate remarked that while breastfeeding might be the best thing to do for most mothers in most parts of the world, in nations where the prevalence of HIV is high, only those mothers with access to highly-active anti-retroviral therapy (HAART) were advised to breastfeed. She had worked with a population that was not advised to breastfeed their babies, and was frustrated by the fact that access to uncontaminated water (both for mixing formula and for cleaning feeding vessels) was nearly as difficult as access to the HAART drugs – making minimization of all risk impossible for these babies born to HIV+ mothers. I had read that, for HIV+ mothers, exclusive breastfeeding, rather than mixed feeding (breastfeeding plus formula) was the safest way to feed her infant, perhaps due to the protective effect of SIgA and other human milk components on the infant’s gut (shown by reduced incidence of transmission in the exclusively breastfed groups in studies cited below). However, a newly-released study offers another explanation, one that adds to the “wow factor” of human milk: antibodies in the milk of HIV-infected mothers actually help neutralize HIV itself.

The study by Friedman, et al. at Duke University in North Carolina, U.S.A. is part of ongoing efforts to develop a vaccine against HIV. Researchers isolated an immunological component of colostrum of HIV+ mothers – HIV-specific B-cells, and noted that they neutralized the virus.

The World Health Organization states:

Mothers known to be HIV-infected (and whose infants are HIV uninfected or of unknown HIV status) should exclusively breastfeed their infants for the first 6 months of life, introducing appropriate complementary foods thereafter, and continue breastfeeding for the first 12 months of life.

Breastfeeding should then only stop once a nutritionally adequate and safe diet without breast milk can be provided (WHO, 2010.)

In many developing nations, the criteria “nutritionally adequate and safe” are not possible to meet; therefore, exclusive breastfeeding remains the most protective method of feeding an infant, even one with an HIV-infected mother; the risk of illness or death from causes related to the replacement feeding methods are significant in these areas of the world. Guidance from the Centers for Disease Control (CDC) in the United States mirrors this, but presumes the availability of replacement feeding that is acceptable, feasible, affordable, sustainable, and safe.

While it could be part of the explanation for why the vast majority (over 90% in some studies) of exclusively-breastfed infants of HIV+ mothers do not contract the virus, the discovery of HIV-specific B-cells in the colostrum of HIV-infected mothers is not yet the “green light” for exclusive breastfeeding for all; however, it offers promise toward understanding and hopefully, gaining the upper hand on HIV transmission rates not just for babies, for entire at-risk populations.

Friedman, J., Alam, S. M., Shen, X., Xia, S. M., Stewart, S., Anasti, K., Pollara, J., et al. (2012). Isolation of HIV-1-neutralizing mucosal monoclonal antibodies from human colostrum.

World Health Organization. (2010). Guidelines on HIV and Infant Feeding.

U. S. Department of Health and Human Services, Centers for Disease Control and Prevention. (2010). Breastfeeding, Human Immunodeficiency Virus (HIV), and Acquired Immunodeficiency Syndrome (AIDS).

Diana Cassar-Uhl, IBCLC and La Leche League Leader, enjoys writing to share breastfeeding information with mothers and those who support them.  In addition to her frequent contributions to La Leche League International’s publication Breastfeeding Today, Diana blogs about normalizing breastfeeding in American culture at and has been a guest blogger at Best for Babes and The Leaky Boob.  Diana can be found lecturing at breastfeeding education events around the United States.  She is pursuing a Master of Public Health, and upon graduation hopes to work in public service as an advisor to policymakers in maternal/child health and nutrition.  Mother to three breastfed children, Diana recently retired after serving as a clarinetist on active military (Army) duty in the West Point Band since 1995.

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7 Responses to Does Breastmilk Neutralize HIV?

  1. ECBrooks 7 June 2012 at 19:12 #

    Just Wow

    • Doug 26 June 2012 at 10:15 #

      Whoo Hoo to Robin, Amber and to ILCA and its JHL Publisher Sage for creating a huelgy successful and helpful resources for IBCLCs, ILCA members, educators, policy makers, and breastfeeding families

  2. Ngozi 22 June 2012 at 14:55 #

    I am also a student and IBCLC pursuing my Master’s In Public Health. I too have introduced the idea of breastfeeding as we have discussed topics such as: obesity, diabetes and infant mortality. Thank you for this post. I am learning more about HIV and Breastfeeding.

  3. kathleen karue 25 June 2012 at 19:51 #

    Big advocator of exclusive breastfeeding,, for the Hiv positive mothers and the non infected. Would like more updates, especially now that we are headed towards the world breastfeeding week where in our hospital we hold an inhouse workshop for our clients. we update them on current trends. thank you

  4. Abbad 27 June 2012 at 03:21 #

    The placenta does a prtety good job of filtering the mother’s blood before allowing it to enter the fetus’ blood. It allows antibodies to pass through, but keeps out most other things. The placenta does a good job of keeping HIV out. However, anything that affect the integrity of the placenta can increase risk, especially issues involving inflammatory processes (eg. premature rupture of fetal membranes, spontaneous preterm delivery and the presence of chorioamnionitis.)Most fetus’ are infected during the birthing process when they come into contact with unfiltered HIV+ blood however, if the woman is on HIV meds and her viral load is undetectable (read: very low) then the chance that she will pass HIV onto her baby is less than 1%. In fact, with an undetectable viral load and HIV meds, a C-section is not (according to recent research) required in most cases . The mother’s viral load is the most important risk factor for mother to child I should let you know that the placental barrier in relation to HIV is still actively being studied and new research may give us more insite into the exact mechanisms of mother to child transmission

  5. Lynette Koning 11 November 2012 at 10:10 #

    The cases of hiv infection is actually getting higher and higher instead of getting lower. too many careless people out there. ‘

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