Taiwan Reports Rise in Gastrointestinal Illness Cases

Taiwan health officials have reported an increase in gastrointestinal illnesses, citing warm and humid weather as a primary factor accelerating the reproduction of bacterial pathogens and increasing the risk of intestinal infectious disease transmission.

Monitoring data from the Taiwan Centers for Disease Control (CDC) for the week ending April 11, 2026, recorded 125,205 outpatient and emergency room visits for diarrhea. This represents an increase from the 119,787 visits recorded in the previous week.

Cluster Infection Data and Pathogen Analysis

Over the four weeks preceding the April 14, 2026, report, a total of 113 cases of diarrhea clusters were reported nationwide. The catering and accommodation industries were identified as the most frequent locations for these clusters.

Of these clusters, 64 cases tested positive for pathogens. Viral pathogens were the most prevalent, accounting for 87.5% of the positive cases, which equals 56 cases. Norovirus was the most common viral pathogen, identified in 50 cases, or 78.1% of the positive clusters.

Bacterial pathogens accounted for 12.5% of the positive clusters, totaling 8 cases. The specific bacterial detections included:

• Staphylococcus aureus detected in 4 cases
• Salmonella detected in 3 cases
• Both Staphylococcus aureus and Salmonella detected in 1 case

Norovirus typing results from March 2026 indicated that GII.17 was the main circulating type, accounting for approximately 47.1%. This is consistent with the circulating type observed in Taiwan in 2025.

Environmental and Behavioral Factors

The CDC stated that the proliferation of bacteria was accelerated by warm and humid weather. This environmental condition, combined with improper food storage, increased the risk of intestinal infectious diseases.

Health officials also noted that the Qingming Festival holiday contributed to the spread, as people traveled extensively and families and friends frequently dined out together.

This trend follows a previous spike in gastrointestinal issues earlier in the year. On February 20, 2026, the CDC reported that more than 7,500 people sought medical attention for diarrhea during the first three days of the Lunar New Year holiday.

Public Health Guidance

The CDC urges the public to maintain strict hand and food hygiene to prevent further transmission. Specifically, officials recommend washing hands properly with soap or hand sanitizer after using the toilet and before eating or preparing meals.

In instances of suspicious cluster infections, the health authorities advise individuals to seek medical help immediately and notify local health authorities to facilitate disease control and prevent cross-infection.