Quiz On Parasitic Gastroenteritis!

The explanation for the given correct answer is that the development of L1, L2, and L3 is dependent on temperature. This means that as the temperature increases, the development of these layers also increases. Conversely, as the temperature decreases, the development of these layers decreases. Therefore, it can be concluded that the statement is true.

Ostertagia is a species of nematode that is capable of overwintering in temperate climates. This means that it can survive the cold winter months and remain dormant until the weather becomes more favorable for its growth and reproduction. This ability allows Ostertagia to persist in temperate regions and continue to infect its host animals, such as cattle or sheep, year after year. In contrast, species like haemonchus, cooperia, and nematodirus may not have the same ability to withstand the harsh conditions of winter and may not be able to survive until the following season.

The primary pathogens of cattle listed in the given options are Nematodirus, Ostertagia ostertagi, and Cooperia spp. These are all types of nematode parasites that commonly infect cattle. Nematodirus is a genus of nematodes that can cause diarrhea and weight loss in young cattle. Ostertagia ostertagi is a species of nematode that primarily affects the abomasum (the fourth stomach compartment) of cattle, leading to reduced appetite and weight gain. Cooperia spp. are another group of nematodes that can cause diarrhea and decreased weight gain in cattle. Therefore, these three pathogens are considered primary threats to cattle health.

This answer suggests that the disease in question has a low incidence or prevalence (morbidity) among the population, meaning that it affects only a small number of individuals. However, it has a high death rate (mortality), indicating that those who do contract the disease are more likely to die from it.

Dictyocaulaus viviparus is the correct answer because it is a type of lungworm that infects cattle, causing a disease known as bovine lungworm. This parasite is commonly found in the respiratory system of cattle and can cause severe respiratory symptoms such as coughing, difficulty breathing, and reduced performance. The other options listed, Onchocerca spp, Thelazia, and Dictyocaulus filaria, are not associated with bovine lungworm and do not cause the same symptoms or affect cattle in the same way.

The primary pathogens of sheep listed in the given options are Trichostrongylus spp, Haemonchus contortus, Ostertagia (teladorsagia) circumcincta, and Nematodirus battus. These are all parasitic nematodes that can cause significant health issues in sheep. Trichostrongylus spp are known to cause trichostrongylosis, a disease that affects the abomasum and small intestine. Haemonchus contortus, also known as the barber's pole worm, is a blood-sucking parasite that can cause anemia and death in sheep. Ostertagia circumcincta is another important parasite that affects the abomasum and can cause weight loss and diarrhea. Nematodirus battus is a common cause of diarrhea in young lambs.

The correct answer is "lambs at first grazing season." Ostertagiosis Type 1 is a parasitic infection that affects lambs during their first grazing season. It is characterized by progressive weight loss and intermittent diarrhea. This infection is caused by the Ostertagia ostertagi parasite, which is commonly found in pastures. Lambs that are exposed to this parasite for the first time during their first grazing season are particularly susceptible to the infection.

Nematodirus produces a large strongyle egg. This means that the egg produced by Nematodirus, a type of parasite, is relatively large in size compared to other strongyle eggs. The size of the egg is an important characteristic for identification and classification purposes.

Haemonchus contortus is a blood-sucking nematode. It is a common parasite found in the abomasum (fourth stomach) of ruminants, such as sheep and goats. This nematode feeds on the blood of its host, causing anemia and other health issues. It is also known as the barber's pole worm due to its appearance, with its white body twisted around red blood-filled intestines. The other options listed, chabertia, ostertagia, and nematodirus, are also nematodes but are not blood-sucking parasites.

Dictyocaulus filaria is a lungworm that commonly affects sheep. It is a parasitic worm that resides in the lungs and bronchial tubes of sheep, causing respiratory issues and potentially leading to pneumonia. This lungworm is not typically found in horses, goats, or pigs, making sheep the correct answer.

Muellerius and Protostrongylus are both types of lungworms that commonly infect sheep and goats. Therefore, the statement that Muellerius, Protostrongylus is the lungworm of sheep and goats is true. These lungworms can cause respiratory issues and other health problems in these animals if left untreated.