Porcine circovirus‐2 in Africa: Identification of continent‐specific clusters and evidence of independent viral introductions from Europe, North America and Asia

Author(s):  
Giovanni Franzo ◽  
Tirumala B.K. Settypalli ◽  
Ebere Roseann Agusi ◽  
Clement Meseko ◽  
Germaine Minoungou ◽  
...  
2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Patricia Pleguezuelos ◽  
Marina Sibila ◽  
Raúl Cuadrado ◽  
Rosa López-Jiménez ◽  
Diego Pérez ◽  
...  

Abstract Background The objective of the present study was to explore the benefits of Porcine circovirus 2 (PCV-2) blanket vaccination in a sow herd on productive parameters, PCV-2 infection and immune status in sows and their progeny. For this purpose, 288 sows were distributed among four balanced experimental groups. One group remained as negative control group and the other three received 1 mL of PCV-2 Ingelvac Circoflex® intramuscularly at different productive cycle moments: before mating, mid gestation (42–49 days post-insemination) or late gestation (86–93 days post-insemination); phosphate buffered saline (PBS) was used as negative control item. Reproductive parameters from sows during gestation and body weight of their progeny from birth to weaning were recorded. Additionally, blood was collected from sows at each vaccination time and piglets at 3 weeks of age. Moreover, up to 4 placental umbilical cords (PUC) per sow were taken at peri-partum. Sera from sows and piglets were analysed for PCV-2 antibody detection using an enzyme-linked immunosorbent assay (ELISA). Sera from sows and PUC were tested to quantify viraemia using a real time quantitative polymerase chain reaction (qPCR) assay. Results Globally, results indicated that vaccinated sows showed heavier piglets at birth and at weaning, less cross-fostered piglets, lower viral load at farrowing as well as in PUC, and higher antibody levels at farrowing, compared to non-vaccinated ones. When all groups were compared among them, sows vaccinated at mid or late gestation had heavier piglets at birth than non-vaccinated sows, and lower proportion of PCV-2 positive PUC. Also, cross-fostering was less frequently practiced in sows vaccinated at pre-mating or mid gestation compared to non-vaccinated ones. Conclusions In conclusion, the present study points out that PCV-2 sow vaccination at different time points of their physiological status (mimicking blanket vaccination) offers benefits at production and serological and virological levels.


2015 ◽  
Vol 28 (10) ◽  
pp. 600-608 ◽  
Author(s):  
Cinzia Zanotti ◽  
Nicola Martinelli ◽  
Davide Lelli ◽  
Massimo Amadori

2012 ◽  
Vol 164 (1-2) ◽  
pp. 43-45 ◽  
Author(s):  
H.J. Nauwynck ◽  
R. Sanchez ◽  
P. Meerts ◽  
D.J. Lefebvre ◽  
D. Saha ◽  
...  

2009 ◽  
Vol 11 (4) ◽  
pp. 288-301 ◽  
Author(s):  
Kandan Aravindaram ◽  
Tsun-Yung Kuo ◽  
Chun-Wen Lan ◽  
Hsiu-Hui Yu ◽  
Pei-Hsueh Wang ◽  
...  

2017 ◽  
Vol 84 (0) ◽  
Author(s):  
Alessandra Marnie Martins Gomes de Castro ◽  
Josete Garcia Bersano ◽  
Sheila Oliveira Silva Souza ◽  
Renato Akio Ogata ◽  
Julia Mitico Nara ◽  
...  

RESUMO: Porcine circovirus 2 (PCV2) está associado a vários sinais clínicos que são designados coletivamente como Circovirose e tem grande impacto na suinocultura. O isolamento viral é classicamente realizado em células da linhagem PK-15, contudo outras células têm sido testadas. Apesar dos avanços nos estudos com PCV2, o isolamento ainda é um desafio. Diante da dificuldade de manutenção dessas linhagens celulares comumente utilizadas associadas à necessidade do uso de substâncias tóxicas para o isolamento de PCV2, os objetivos do presente trabalho foram descrever o primeiro isolamento de Porcine circovirus 2b em linhagens de células de macrófago (J744) e verificar a taxa de mutação nesse sistema. Uma amostra de pulmão foi submetida ao sequenciamento e agrupada ao genótipo PCV2b. Essa amostra foi utilizada para inocular uma garrafa de J744 (com 30% de confluência em meio RPMI com 10% de soro fetal bovino) e submetida a cinco passagens, as quais foram acompanhadas por reação em cadeia da polimerase quantitativa (PCRq). As cargas virais inicial e final foram de 2,90 × 103 e de 4,45 × 108 cópias de DNA/µL para PCV2b, respectivamente. O sequenciamento confirmou o isolamento e descartou o coisolamento de mais de um genótipo. Após cinco passagens, o isolado apresentou identidade de 99,7%, com descrição de cinco mutações pontuais, uma sinônima e quatro não sinônimas, observadas nas regiões do gene cap e rep. Os resultados obtidos demonstram que as células J744 apresentam a susceptibilidade, e a instabilidade do vírus em J744 será importante para a compreensão do vírus.


2020 ◽  
Vol 6 (1) ◽  
pp. 038-040
Author(s):  
JB Rajesh ◽  
S Rajkhowa ◽  
U Dimri ◽  
H Prasad ◽  
K Sarma ◽  
...  

2015 ◽  
Vol 38 (3) ◽  
pp. 163-166
Author(s):  
Jun-Hyung Sohn ◽  
Sung-Ho Shin ◽  
Soon-Tae Kim ◽  
Sung-sam Lee ◽  
Mun-Jo Yun ◽  
...  

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