Assessment of Porcine Reproductive and Respiratory Syndrome Virus RNA Load in Sera and Tissues during Acute Infection
Journal of Veterinary Science
;
: 75-85, 2002.
Artículo
en Inglés
| WPRIM
| ID: wpr-172832
ABSTRACT
Porcine reproductive and respiratory syndrome virus (PRRSV) RNA load in sera and tissues during acute phase of infection was evaluated using a PCR- based quantitative assay. More than 80% of infected pigs (21/25) showed the peak level of viral RNA concentrations in serum (up to 8.6 x 108 copies/ml) at day 5 postinfection (PI), and started to clear the virus from the systemic circulation thereafter. Regression analysis using the viral RNA concentrations in sera obtained from days 5 to 14 PI showed that the viral RNA was cleared at the rate of 0.37 log reduction in the number of PRRSV RNA copies per day. It was estimated to be day 27 PI when the viral RNA in the serum of infected pigs becomes undetectable. When correlation analysis was performed between the systemic clearance rate and viral RNA concentrations in tissues of 9 infected pigs obtained at day 14 PI, moderately strong negative correlation was observed in the thymus (r = - 0.62) and brain stem (r = - 0.48), suggesting the capability of host animal to clear PRRSV from the systemic circulation appears to be related to the viral activity in the thymus and brain stem.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Estándares de Referencia
/
Porcinos
/
Factores de Tiempo
/
Viremia
/
Tronco Encefálico
/
ARN Viral
/
Modelos Logísticos
/
Virus del Síndrome Respiratorio y Reproductivo Porcino
/
Síndrome Respiratorio y de la Reproducción Porcina
/
Carga Viral
Tipo de estudio:
Estudio pronóstico
/
Factores de riesgo
Límite:
Animales
Idioma:
Inglés
Revista:
Journal of Veterinary Science
Año:
2002
Tipo del documento:
Artículo
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