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Clinical and Diagnostic Laboratory Immunology, March 1999, p. 181-185, Vol. 6, No. 2
1071-412X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Rotavirus G-Type Restriction, Persistence, and Herd Type Specificity in Swedish Cattle Herds

K. de Verdier Klingenberg,1,* M. Nilsson,2 and L. Svensson2

Department of Ruminant and Porcine Diseases, National Veterinary Institute, S-750 07 Uppsala,1 and Department of Virology, Swedish Institute for Infectious Disease Control, S-105 21 Stockholm,2 Sweden

Received 13 October 1998/Accepted 25 November 1998

G-typing of rotavirus strains enables the study of molecular epidemiology and gathering of information to promote disease prevention and control. Rotavirus strains in fecal specimens from neonatal calves in Swedish cattle herds were therefore characterized by using G1 to -4-, G6-, G8-, and G10-specific primers in reverse transcription (RT)-PCR. Fecal samples were collected from one dairy herd (herd A) for 4 consecutive years and from 41 beef and dairy herds (herd B) experiencing calf diarrhea outbreaks. Altogether, 1,700 samples were analyzed by group A rotavirus enzyme-linked immunosorbent assay, and 98 rotavirus-positive specimens were selected for G-typing by RT-PCR. The effect of herd type, time, geographic region, and clinical symptoms on the G-type distribution was evaluated. Altogether (herds A and B), G10 was found in 59 (60.2%) fecal specimens, G6 was found in 30 (30.6%) specimens, G3 was found in 1 (1.0%) specimen, and G8 was found in 1 (1.0%) specimen. Seven (7.1%) fecal specimens were not typeable. Herd type specificity in the G-type distribution was demonstrated in the herds in herd B. In the 6 beef suckler herds, only G6 was detected, while rotavirus strains from the 35 dairy herds were predominantly (54%) G10. The G-type distribution was restricted in herds A and B. Twenty-nine of 30 strains from herd A were characterized as G10. In the vast majority of herds in herd B, a single G-type was identified. The serotype G10 and the electropherotype persisted over time in herd A. No characteristic G-type variation in the geographic distribution of cattle herds in herd B was obvious. There was no difference in the G-type distributions between the strains from clinically and subclinically rotavirus-infected calves in dairy herd A. The results from this study strongly indicate a pronounced stability in the rotavirus G-type distribution in Swedish cattle herds, which emphasizes the importance of continuous preventive measures for control of neonatal calf diarrhea. A future bovine rotavirus vaccine in Sweden should contain G10 and G6 strains.

* Corresponding author. Mailing address: National Veterinary Institute, Box 7073, S-750 07 Uppsala, Sweden. Phone: 46 18 67 41 44. Fax: 46 18 30 91 62. E-mail: Kerstin.Klingenberg{at}sva.se.

Clinical and Diagnostic Laboratory Immunology, March 1999, p. 181-185, Vol. 6, No. 2
1071-412X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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