TY - JOUR
T1 - Assessment of the Vaccination Program against Cystic Echinococcosis in Sheep in the Pehuenche Community of Central Chile
AU - Gädicke, Paula
AU - Heath, David
AU - Medina-Brunet, Angela
AU - Siva-De la Fuente, María Carolina
AU - Espinoza-Rojas, Hellen
AU - Villaguala-Pacheco, Carmen
AU - Rubilar, Makarena
AU - Cerda, Carolina
AU - Quezada, Manuel
AU - Rojas, Daniela
AU - Henríquez, Analía
AU - Loyola, Marco
AU - Landaeta-Aqueveque, Carlos
N1 - Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - Echinococcosis is a neglected zoonosis that uses dogs and sheep as its main hosts in Chile. The Eg95 vaccine against sheep infection has been included in some control programs. Here, we assess the efficacy of the vaccination program in the hyperendemic Alto Biobío commune after 3 years of execution. Fisher’s test and generalized linear models were used in the assessment. The program tried to offer a first dose at 2 months of age, a booster 1 month later, and yearly vaccination. Given logistic difficulties, important delays in vaccination occurred, and most animals did not receive the first booster. Dog deworming was not included in the program. Likely due to the aforementioned factors, the overall frequency of infection was not lower, but the proportion of large (>5 mm) cysts and fertile cysts was smaller after the program. The frequency of infection and/or the number of cysts were lower when the age at first dose was younger and the first booster was administered 1 month after the first dose. The results suggest that vaccination affects both cyst development after the larvae reach the target organs, as well as the development of the protoscolex once the cysts start developing.
AB - Echinococcosis is a neglected zoonosis that uses dogs and sheep as its main hosts in Chile. The Eg95 vaccine against sheep infection has been included in some control programs. Here, we assess the efficacy of the vaccination program in the hyperendemic Alto Biobío commune after 3 years of execution. Fisher’s test and generalized linear models were used in the assessment. The program tried to offer a first dose at 2 months of age, a booster 1 month later, and yearly vaccination. Given logistic difficulties, important delays in vaccination occurred, and most animals did not receive the first booster. Dog deworming was not included in the program. Likely due to the aforementioned factors, the overall frequency of infection was not lower, but the proportion of large (>5 mm) cysts and fertile cysts was smaller after the program. The frequency of infection and/or the number of cysts were lower when the age at first dose was younger and the first booster was administered 1 month after the first dose. The results suggest that vaccination affects both cyst development after the larvae reach the target organs, as well as the development of the protoscolex once the cysts start developing.
KW - Echinococcosis control
KW - Echinococcus
KW - Eg95
KW - Hydatid cyst
KW - Indigenous people
KW - Ovine
KW - Vaccine
KW - Zoonosis
UR - http://www.scopus.com/inward/record.url?scp=85126037727&partnerID=8YFLogxK
U2 - 10.3390/ani12060679
DO - 10.3390/ani12060679
M3 - Article
AN - SCOPUS:85126037727
SN - 2076-2615
VL - 12
JO - Animals
JF - Animals
IS - 6
M1 - 679
ER -