Mark each statement as true or false. Rewrite the false statements to make them true by changing the underlined word(s).


__________ Examination of stool samples can reveal the presence of Naegleria parasites.

Verified step by step guidance

1. Step 1: Understand the organism mentioned. Naegleria is a genus of free-living amoebae, but it is not typically found in stool samples. Instead, Naegleria fowleri is known for causing a rare but severe brain infection called primary amoebic meningoencephalitis (PAM), usually acquired through contaminated water entering the nasal passages.
2. Step 2: Identify the correct sample type for detecting Naegleria. Since Naegleria infects the brain and central nervous system, it is usually detected in cerebrospinal fluid (CSF) or brain tissue, not stool.
3. Step 3: Mark the original statement as false because stool samples are not used to detect Naegleria parasites.
4. Step 4: Rewrite the false statement by replacing 'stool samples' with 'cerebrospinal fluid samples' to make it true: 'Examination of cerebrospinal fluid samples can reveal the presence of Naegleria parasites.'
5. Step 5: Review the corrected statement to ensure it aligns with microbiological knowledge about Naegleria detection and infection sites.

Key Concepts

Naegleria Parasite Characteristics

Naegleria is a genus of free-living amoebae, with Naegleria fowleri being the most notable species causing primary amoebic meningoencephalitis. It is typically found in warm freshwater environments, not in the human gastrointestinal tract, and thus is not detected in stool samples.

Diagnostic Methods for Parasitic Infections

Different parasites require specific diagnostic samples; stool examination is used for intestinal parasites, while other parasites like Naegleria are diagnosed through cerebrospinal fluid or brain tissue analysis. Understanding the appropriate sample type is crucial for accurate diagnosis.

Stool Sample Examination

Stool examination is a common diagnostic tool for detecting intestinal parasites such as Giardia, Entamoeba, and helminths. It involves microscopic analysis to identify eggs, cysts, or trophozoites present in fecal matter, but it is not suitable for detecting parasites that do not inhabit the gut.