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. 1996 May;70(5):2894–2901. doi: 10.1128/jvi.70.5.2894-2901.1996

Frequent perinatal transmission of feline immunodeficiency virus by chronically infected cats.

L L O'Neil 1, M J Burkhard 1, E A Hoover 1
PMCID: PMC190147  PMID: 8627764

Abstract

Vertical transmission of feline immunodeficiency virus (FIV) was studied in cats infected with either of two FIV clinical isolates (FIV-B-2542 or FIV-AB-2771) prior to breeding and conception. Queens infected 4 to 30 months (mean = 14 months) prior to conception transmitted FIV to 59 of 83 (71%) kittens; 50.6% were virus positive on the day of birth. To examine potential routes of FIV transmission from mother to offspring, kittens were delivered via either vaginal or cesarean birth and nursed by either their virus-infected natural mothers or uninfected surrogate mothers. Comparison of FIV infection rates at birth with those at 6 months of age in kittens delivered by cesarean and surrogate raised demonstrated that late in utero transmission occurred in approximately 20% of kittens. Comparison of kittens nursed by FIV mothers with those by uninfected surrogate mothers demonstrated a 13.5% increase in infection rate of kittens exposed to milk-borne virus. Isolation of virus from 40% of maternal vaginal wash samples and the slightly greater infection rate in vaginally versus cesarean-delivered surrogate-nursed kittens suggested that intrapartum transmission may occur. In addition, we found that low maternal CD4 count (<200 cells per microl), longer duration of maternal infection (>15 months), and maternal symptoms of clinical immunodeficiency correlated with increased rates of mother-to-kitten FIV transmission, paralleling observations in human immunodeficiency virus-infected women. We conclude that FIV infection provides a model in which to explore aspects of human immunodeficiency virus vertical transmission and intervention difficult to address in human patients.

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Selected References

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