Taenia saginata (beef tapeworm) causes less serious infection than taenia solium (pork tapeworm), because –
**Question:** Taenia saginata (beef tapeworm) causes less serious infection than taenia solium (pork tapeworm), because -
**Core Concept:**
Taenia saginata and Taenia solium are two tapeworm species responsible for human infections, specifically caused by ingesting undercooked beef and pork, respectively. These infections are known as cysticercosis and neurocysticercosis. The severity of the infection depends on the location of the tapeworm larvae within the host's body.
**Why the Correct Answer is Right:**
Taenia saginata (beef tapeworm) causes less serious infections than Taenia solium (pork tapeworm) due to the different locations where the tapeworm larvae settle in the human body. Taenia solium larvae primarily invade the central nervous system (CNS), leading to neurocysticercosis, which can cause neurological symptoms, seizures, and even death if left untreated. In contrast, Taenia saginata larvae settle in the submucosa of the intestines, causing cysticercosis, which usually results in mild gastrointestinal symptoms, such as abdominal pain, diarrhoea, and sometimes nutrient deficiencies due to malabsorption.
**Why Each Wrong Option is Incorrect:**
A. This option is incorrect because the severity of infection is not directly related to the host's age. The choice of beef or pork tapeworm does not depend on the individual's age and is rather determined by the consumption of the respective contaminated food sources.
B. This option is incorrect because the severity of infection is not determined by the host's gender. The choice between beef and pork tapeworm infections is based on the consumption of the appropriate meat source, not gender.
C. This option is incorrect because the severity of infection depends on the life cycle of the tapeworms rather than the host's BMI. Taenia saginata and Taenia solium have distinct life cycles and infection patterns. The choice between beef and pork tapeworm infections is based on human behavior, specifically eating undercooked beef and pork, respectively, rather than their impact on the host's body condition.
D. This option is incorrect because the severity of infection is not determined by the host's body mass index (BMI). The choice between beef and pork tapeworm infections is determined by the consumption of contaminated meat products, not the host's BMI.
**Clinical Pearl:**
The severity of Taenia saginata and Taenia solium infections is based on the consumption of raw or undercooked beef and pork, respectively. Ingesting this contaminated meat allows the tapeworm larvae to enter the human body and develop into adult worms, which then produce eggs that are excreted in the feces, potentially contaminating the environment and reinfecting humans. Cysticercosis caused by Taenia solium is more severe due to the larvae's invasion of the CNS, leading to neurocysticercosis, which can cause severe neurological symptoms and complications.
**Correct Answer:**
The correct answer is **D.** The severity of the infection depends on the tapeworm species, not the host