Dynamics of Torque teno sus virus 1 (TTSuV1) and 2 (TTSuV2) DNA loads in serum of healthy and postweaning multisystemic wasting syndrome (PMWS) affected pigs

D. Nieto (1) , M. Aramouni (1) , L. Grau-Roma (1, 2) , J. Segalés (1, 2) , T. Kekarainen (1)

1 Centre de Recerca en Sanitat Animal (CReSA)
2 Departament de Sanitat i Anatomia Animals

Torque teno viruses (TTVs) are vertebrate infecting, small viruses with circular single stranded DNA, classified in the family. In pigs, two different TTV species have been described so far, (TTSuV1) and (TTSuV2). TTSuVs have lately been linked to postweaning multisystemic wasting syndrome (PMWS). In the present study, TTSuV1 and TTSuV2 prevalence and DNA loads in longitudinally collected serum samples of healthy and PMWS affected pigs from Spanish conventional, multi-site farms were analyzed. Serum samples were taken at 1, 3, 7, 11 and around 15 weeks of age (age of PMWS outbreak) and viral DNA loads determined by quantitative PCR. For both TTSuV species, percentage of viremic pigs increased progressively over time, with the highest prevalence in animals of about 15 weeks of age. TTSuV1 and TTSuV2 viral DNA loads in healthy and TTSuV1 loads in PMWS affected animals increased until 11 weeks of age declining afterwards. On the contrary, TTSuV2 DNA loads in PMWS affected pigs increased throughout the sampling period. It seems that TTSuV species differ in the infection dynamics in PMWS affected animals.

Mots clés: infection dynamics; Anelloviridae; Torque teno sus virus 1 (TTSuV1); Torque teno sus virus 2 (TTSuV2); postweaning multisystemic wasting syndrome (PMWS); infection dynamics.

Domaines: Médecine vétérinaire et santé animale

D. Nieto, M. Aramouni, L. Grau-Roma, J. Segalés, T. Kekarainen. Dynamics of Torque teno sus virus 1 (TTSuV1) and 2 (TTSuV2) DNA loads in serum of healthy and postweaning multisystemic wasting syndrome (PMWS) affected pigs. Veterinary Microbiology, 2011, 152 (3-4), pp.284. ⟨10.1016/j.vetmic.2011.05.020⟩. ⟨hal-00724196⟩