NAG Vibrio cholerae isolated from imported shellfish in Guam.

Area of Science:

• Microbiology
• Food Safety
• Public Health

Background:

• Shellfish are a common source of foodborne illness globally.
• Vibrio cholerae, including non-O1 strains, can contaminate seafood.
• Effective monitoring of imported food products is crucial for public health.

Purpose of the Study:

• To assess the microbiological safety of imported shellfish available in Guam's markets.
• To identify the prevalence of Non-O1 Vibrio cholerae (NAG V. cholerae) and coliform bacteria.
• To determine potential sources of contamination and inform regulatory actions.

Main Methods:

• Survey of imported shellfish lots from public markets on Guam.
• Microbiological testing for Non-O1 Vibrio cholerae (NAG V. cholerae) presence.
• Quantification of coliform counts in shellfish samples.

Main Results:

• Non-O1 Vibrio cholerae (NAG V. cholerae) was detected in 10 out of 38 sample lots.
• High coliform counts (exceeding 2400 per 100g) were found in 21 out of 33 sample lots.
• NAG V. cholerae contamination correlated with high coliform counts and shellfish originating from fresh or brackish waters.

Conclusions:

• Imported shellfish in Guam pose a risk due to NAG V. cholerae and high coliform contamination.
• Freshwater and brackish water sources are likely origins of contamination.
• Prohibition of shellfish importation from unapproved sources is a necessary public health measure.