Naume Tavengwa Ellen Piwoz Lorrie Gavin Clare Zunguza Edmore Marinda Peter Iliff Jean Humphrey
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Transcript of Naume Tavengwa Ellen Piwoz Lorrie Gavin Clare Zunguza Edmore Marinda Peter Iliff Jean Humphrey
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Education and counseling make a difference to infant feeding practices and those feeding
practices make a difference to infant mortality
Naume Tavengwa Ellen PiwozLorrie GavinClare ZunguzaEdmore MarindaPeter IliffJean Humphrey and the ZVITAMBO Study Group
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Acknowledgements• Canadian International Development Agency• United States Agency for International Development• Academy for Educational Development (USAID)
– Linkages Project– SARA Project
• Rockefeller Foundation• BASF
• University of Zimbabwe• Harare City Health Department• Harare Central Hospital• Chitungwiza Hospital• Epworth Clinic, Mashonaland East Province
• Johns Hopkins University• McGill University
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Every Year
Breast Feeding
Prevents 6 million infant deaths
Causes ¼ million infant HIV infections
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15% get infected through breast feeding
85% DO NOT
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Methods Placebo-controlled clinical trial•14,110 mother/baby pairs
•efficacy of immediate post partum maternal and/or neonatal vitamin A supplementation on
•infant mortality, •breast feeding-associated infant HIV infection •incident sexually-acquired HIV infections
among post partum women.
ZVITAMBO
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Pairs recruited within 96 hours of delivery at maternity clinics and hospitals in Harare, Chitungwiza and Epworth
Eligibility
•neither mother nor baby seriously ill
•singleton,
•birth weight >1500 g
•Written informed consent
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Baseline (delivery)
•demographic and obstetric details • maternal arm circumference •Mothers and babies randomised:400,00
050,000
400,000Placebo
Placebo50,000
PlaceboPlacebo
IU Vitamin A
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Maternal samplesrun in parallel - two ELISAs.
Persistently discordant samples run by Western blot.
HIV positivityconfirmed by repeated ELISA at next visit.
Mother-baby pairs followed up in study clinic 6 weeks3 months, 3-monthly until 12-24 months.
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Mothers HIV status by age group
560
2235
1651
3764
1304
1747
542
705
198
407
34
107
0%
20%
40%
60%
80%
100%
<20 20- 24 25- 29 30- 34 35- 39 >=40
-ve+ve
20% 30% 43% 43% 33% 24%
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Seroconversion rates
At one year: 4-5%
Straight line
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Duration of Breast feeding ZVITAMBO cohort
Age of baby % still breast feeding
6 weeks 99.7
3 months 99.4
6 months 99.0
9 months 98.1
1 year 93.9
15 months 85.7
18 months 63.0
21 months 31.5
2 years 17.0
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Feeding practice
• Exclusive breast feeding (EBF)– nothing except breast milk, – western-type medicines and vaccines allowed
• Predominant breast feeding (PBF)– breast milk + other non-milk containing liquids eg water,
fruit juice, tea without milk
• Mixed milk feeding (MMF)– breast milk + other animal milk including commercial
formula, with or without other liquids
• Complementary (Comp)– breast milk + solid food, with or without other liquids or
other milk
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Definitions
• 24 hour history• 7 day history• Ever• “Conditional ever”
– All previous data present and consistent
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• 3 clinical trial questions
4th Question– How can these mothers (and fathers)
be counselled about HIV and infant feeding?
ZVITAMBO TRIAL
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Formative Research FindingsFocus Groups
In-depth interviewsTIPS
Research from elsewhereExclusive B/F
Mastitis
RecommendationsWHO/UNAIDS
MoH, Zimbabwe
INTERVENTION
MONITORING
EVALUATIONand IMPACT
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FORMATIVE RESEARCH SELECTED FINDINGS
Misconceptionsevery baby of an HIV+ mother gets infectedmixing feeds risk of transmission
Ignoranceinfection during lactation risk of breast milk transmission
GenderMen understand their role in decreasing transmission during lactationMen and women see the man as decision maker
including about infant feedingMen want to learn about MTCT directly, not via the wife
FearMothers are fearful of getting tested, especially without their partners
Costcost of infant formula is for many prohibitive
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RESEARCH FINDINGS FROM ELSEWHERE
Exclusive breast feeding (compared to mixed feeding) protective of MTCT of HIV in breast milk
Mastitis, including subclinical mastitis, a risk factor for MTCT
RECOMMENDATIONS FROM UN AGENCIES AND MoH ZIMBABWE
Women should be empowered to make their best personal choice
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INTERVENTION
Antenatal sensitization
Male outreach
Integration of infant feeding counseling into HIV pre- and post-test counseling
Supportive counseling
Referral
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0
2
4
6
8
10
12
Pre- intervention Post- intervention
perc
ent
5.3
9.7
Always used since last visit
Sometimes or mostly used since last visit
male or female condom use(assessed at 6 months, if sexually active)
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0 20 40 60 80 100
YES to all 3
Support baby's head and body in straight
line
Position baby close and facing breast
Mother comfortable and relaxed
Correct recall Observed practising
Mothers’ recall and observed practice of infant positioning and attachment
(1)
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0 20 40 60 80
YES to all 3
A lot of areola in mouth
Baby's lip turned outward
Baby's mouth wide open
Mothers’ recall and observed practice of infant positioning and attachment
(2)
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45
12
17
0
2
4
6
8
10
12
14
16
18
perc
ent
Conditional EverEver7 day recall24 hr recall
Rates of Exclusive Breast feeding at 3/12 by method of classification (total cohort)
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0
20
40
60
80
100
0 d 6 wks 3 mo 6 mo
Pre-intervention(n = 4,984 - 11,135)
EBFPBF
Comp
“Ever” definition
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0
20
40
60
80
100
0 d 6 wks 3 mo 6 mo
Post-intervention(n = 492-1,402)
EBF
PBF
Comp
p< 0.01, controlled for maternal age, parity, mother’s or father’s education, and birth weight
“Ever” definition
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19
9
20
5
10
15
20
perc
ent
Intervention package including individual counseling
Intervention package but no individual counseling
Pre-intervention cohort (n=7,625)
Exclusive breast feeding rates at 3/12(“conditional ever” method, n=732)
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0
20
40
60
80
100
0
20
40
60
80
100
0 d 6 wks 3 mo 6 mo
EBF
PBFComp
EBF
PBFComp
No counseling available
Counseling available
Recruitment site “conditional ever” n = 439-687
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Counseling
• Mostly (73%) ‘one off’• Duration 30-40
minutes
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Disclosure
• Disclosure rate for HIV+ – Pre-intervention 52%– Post-intervention 64%
• Disclosure rate for HIV-– Pre-intervention 80%– Post-intervention 89%
p<0.05
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Feeding and disclosure
5
9
22
0
5
10
15
20
25
% E
BF a
t 3/1
2
Noone Husband
+/- other
Other than
husband
“Conditional ever” n=160
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210
10495
50
0
50
100
150
200
250
EBF PBF CF MMF
deat
hs p
er 1
000
1st year mortality of babies of HIV + mothers by feeding pattern to 3/12
(“ever”, n=2892)
Compare with mortality rate of 22/1000 for babies of HIV- mothers, and 170/1000 for all babies of HIV+
mothers
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Kaplan-Meier survival estimates (babies of HIV+ mothers, “ever”)
0
0.05
0.1
0.15
0.2
0.25
0 1 1.5 2 3 4 5 6 7 8 9 10 11 12
EBF PBF MMF Comp
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Hazard Ratios (babies of HIV+ mothers, adjusting for birth weight, CD4,
arm circumference, “ever”)
1
2.522.84
5.97
0
1
2
3
4
5
6
EBF PBF Comp MMFp: 0.04 0.02 0.001
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Hazard Ratios (babies of HIV- mothers, adjusting for birth weight, “ever”)
1 1.19 1.36
2.76
0
1
2
3
4
5
6
EBF PBF Comp MMF
No statistical significance
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Conclusions
• The dilemma over breast or formula is difficult
• There is scope and possibility to substantially increase exclusive breast feeding rates
• Exclusive breast feeding is associated with lower mortality than mixed feeding