RESUMO
H9N2 influenza A virus (IAV) causes low pathogenic respiratory disease and infects a wide range of hosts. In this study, six IAVs were isolated from mink and identified as H9N2 IAV. Sequence analysis revealed that the six isolates continued to evolve, and their PB2 genes shared high nucleotide sequence identity with H7N9 IAV. The six isolates contained an amino acid motif PSRSSR↓GL at the hemagglutinin cleavage site, which is a characteristic of low pathogenic influenza viruses. A serosurvey demonstrated that H9N2 IAV had spread widely in mink and was prevalent in foxes and raccoon dogs. Transmission experiments showed that close contact between H9N2-infected mink and naive mink, foxes and raccoon dogs resulted in spread of the virus to the contact animals. Furthermore, H9N2 challenge experiments in foxes and raccoon dogs showed that H9N2 IAV could infect these hosts. Virological and epidemiological surveillance of H9N2 IAV should be strengthened for the fur animal industry.
Assuntos
Transmissão de Doença Infecciosa , Vírus da Influenza A Subtipo H9N2/crescimento & desenvolvimento , Infecções por Orthomyxoviridae/veterinária , Motivos de Aminoácidos/genética , Animais , Anticorpos Antivirais/sangue , Raposas , Vírus da Influenza A Subtipo H9N2/classificação , Vírus da Influenza A Subtipo H9N2/genética , Vírus da Influenza A Subtipo H9N2/isolamento & purificação , Vison , Infecções por Orthomyxoviridae/transmissão , Infecções por Orthomyxoviridae/virologia , RNA Polimerase Dependente de RNA/genética , Guaxinins , Análise de Sequência de DNA , Estudos Soroepidemiológicos , Proteínas Virais/genéticaRESUMO
Objective To summarize the clinical experience in the replacement of the damaged sec- ond metacarpophalangeal joint with the second metatarsophalangeal joint with a pedicle of dorsal pedis artery and great saphcnous vein.Methods The damaged second metacarpophalangeal joint,distal part of the sec- ond metacarpal and proximal part of the proximal phalanx were dissected.The metatarsophalangeal joint was transferred to the region of metacarpophalangeal joint of hand.The dorsal pedis artery was anastomosed to the radial artery,and the great saphenous vein was anastomosed to the cephalic vein at anatomical snuff-box.The dissected bones of the hand removed of the cartilage of joint and soft tissue were grafted back to the donor site of the foot.Results A 5～30 month follow-up study in 8 out of 11 cases showed that satisfactory functional recovery was achieved in clinical practice.The movement of second metacarpophalangeal joint was excellent. Conclusion The function of the second metacarpophalangeal joint can be effectively recovered by the trans- fer of the vascularized second metatarsophalangeal joint.
