ATLANTA--Although prolonged breastfeeding is well known to be a major route of transmission of HIV infection to infants and is estimated to cause one-third to one-half of new infant HIV-1 infections worldwide, the majority of breastfed infants with HIV-positive mothers remain uninfected, even after months of exposure.

Investigators at Emory University School of Medicine, the Centers for Disease Control and Prevention, the Emory Vaccine Center, and the University of Paris reviewed the scientific literature to pinpoint the reasons why many breastfed infants resist HIV, with the goal of devising future intervention strategies to prevent newborn infections. Their findings were published online in November and will be published in the December issue of The Lancet Infectious Diseases.

The researchers, led by Athena P. Kourtis, MD, PhD, MPH, formerly assistant professor of pediatrics at Emory University School of Medicine (now at Eastern Virginia Medical School and working at CDC) and Chris Ibegbu, PhD of the Emory Vaccine Center, identified several factors that have been cited by scientists as potentially enabling or preventing transmission of HIV through breastfeeding. Enabling factors could include the introduction of HIV into the gastrointestinal tract through a breach in the cell layer in the intestinal lining, or immune activation in the gastrointestinal tract could cause more HIV virus to reach this epithelial layer. Protective factors may include the hostile environment presented to viruses by the saliva and its various viral-inhibiting components.

The presence of HIV antibody in saliva already has been recognized in HIV-infected individuals, but scientists do not yet know whether this antibody is developed in non-infected breastfed infants, or whether it has a protective role against HIV. Natural killer (NK) cells or natural antibodies to HIV in exposed mucosal surfaces of infants could also play a role in resistance to HIV infection. Acqui
'"/>

Contact: Tia Webster
twebste@emory.edu
404-727-5692
Emory University Health Sciences Center
25-Nov-2003

Page: 1 2
Related medicine news :

1. Emory Study finds HIV is not an independent risk factor for severe heart disease
2. Emory cardiologists present research at AHA scientific sessions in New Orleans, Nov. 7 - 10
3. Emory study finds mental health and heart disease tightly linked
4. Emory conference to educate health professionals about metabolic syndrome
5. Emory researcher examines effects of antiepileptic drugs on pregnant women and their offspring
6. Emory researchers find race and gender gaps in treatment of heart attack
7. Emory, GlaxoSmithKline, NIMH enter public-private partnership to develop new drugs for depression
8. Emory scientists find marker for long-term immunity
9. Emory scientists find oral tetrahydrobiopterin can reduce high blood pressure
10. Emory scientists link atrial fibrillation with decrease in nitrous oxide
11. Immune memory from smallpox vaccination lasts more 50 years, according to Emory research