Introduction

A cruise ship was in the middle of a sea voyage when one passenger suddenly developed vomiting and diarrhea. At first, people believed it was only ordinary gastroenteritis, which can be common during long-distance travel. However, within less than one day, more and more people on board began to experience nausea, vomiting, and diarrhea.

Some passengers with more severe symptoms also developed low-grade fever, abdominal pain, and dehydration. The cause was norovirus. Although its fatality rate is not high, norovirus is highly contagious and can spread rapidly.

After receiving the customer’s request, Vantsteri engineers quickly developed a disinfection plan for the cruise ship. For this large-scale project, Vantsteri used 60 disinfection units, 15 engineers, and 1 ton of disinfectant solution to complete the disinfection task within 16 hours.

Cruise Ship Disinfection Plan

Drinking Water System

Cleaning and disinfecting drinking-water tanks and water-circulation pipelines is essential for ensuring water safety. First, the water inlet to the tank was closed and the water inside was drained. Vantsteri cleaning agents were then used to deeply clean the inner walls and bottom of the tank, removing dirt and sediment.

After cleaning, Vantsteri disinfectant and disinfection technology were used to disinfect the pipelines and help ensure that there was no microbial contamination inside the system. Throughout the process, water-quality changes were strictly monitored to ensure operational safety and compliance with environmental requirements.

After cleaning and disinfection were completed, the water inlet valve was reopened. Water-quality testing instruments were then used to test the water. The system was put back into use only after all indicators met national standards.

Water Recreation and Entertainment Systems

All water filters were cleaned and replaced. Vantsteri cleaning agents were used on the inner walls and bottoms of the facilities to remove dirt and sediment. After cleaning, Vantsteri disinfectant and disinfection technology were used to disinfect the inner surfaces.

The disinfection methods used by Vantsteri engineers fully considered material compatibility to help ensure the safety of facilities, equipment, and materials.

Shower and Sanitary Facilities

The wastewater drainage system is an important part of the disinfection process. Vantsteri engineers recognized its importance and carefully marked every floor drain and drainage-pipe opening.

The engineers first conducted a comprehensive inspection and assessment of the drainage system to identify potential risk points and contamination sources. Vantsteri disinfection equipment and disinfectants were then used to disinfect each floor drain and drainage-pipe opening, helping ensure the removal of harmful microorganisms such as bacteria and viruses.

Other Cruise Ship Areas

The disinfection plan also covered air-conditioning systems, food-service areas, accommodation rooms, and entertainment venues.

During the disinfection process, Vantsteri service engineers recorded the location of each treatment point, the treatment time, and the disinfection process used. Chemical indicators and biological indicators were also used for disinfection-effect evaluation and monitoring.

The engineers’ professional, detailed, and responsible work helped support the safety and hygiene of the cruise ship systems and protect public health.

Why Can an Ordinary Cruise Ship Become a “Horror Cruise”?

Why can an ordinary vessel become a “horror cruise”? Why have ships repeatedly been affected by disease outbreaks during the long history of human efforts to fight viruses?

Vantsteri provides the following explanation.

The Special Characteristics of Cruise Ships

A Large, Mobile Microbial “Culture Medium”

A cruise ship is a relatively enclosed environment. Its air-conditioning system and water-circulation system can be difficult to disinfect.

Because of the limited space, air-conditioning systems must operate continuously to maintain a comfortable environment inside the cabins. Water-circulation systems are responsible for supplying drinking water and sanitary water on board.

Once these systems become contaminated, viruses and bacteria can spread rapidly in an enclosed environment and pose a serious threat to the health of people on board.

Norovirus: Difficult to Detect and Difficult to Remove with General Disinfectants

The article describes norovirus as difficult to detect and not easily removed by general disinfectants.

Norovirus was first discovered in 1972 and cannot currently be cultured artificially. According to Dr. Mary Estes of Baylor College of Medicine, researchers have attempted to culture norovirus in laboratories for many years. Although other viruses have been successfully cultured, norovirus has remained difficult to study and manage.

Key Takeaways

Conclusion

Cruise ships are relatively enclosed environments with continuously operating air-conditioning systems and water-circulation systems. Once contamination occurs in these systems, viruses and bacteria may spread rapidly and affect the health of passengers and crew.

For this cruise ship norovirus incident, Vantsteri developed a large-scale disinfection plan covering drinking-water systems, water recreation systems, shower and sanitary facilities, drainage systems, air-conditioning systems, food-service areas, accommodation rooms, and entertainment venues.

Through systematic cleaning, disinfection, process documentation, and the use of chemical and biological indicators for monitoring, Vantsteri engineers completed the disinfection task for the cruise ship.