Beijing mother discovers mould-filled straw caused her child’s persistent cough and severe diarrhoea—experts warn millions of users are at risk.
As Hong Kong swelters through another scorching summer, many residents have turned to large-capacity straw cups as their go-to hydration companion. These trendy bottles promise convenience, encouraging frequent sips throughout the day. But beneath the sleek designs and colourful silicone straws lurks a troubling reality: even cups used exclusively for water can become breeding grounds for dangerous mould and bacteria.
A recent report from People’s Daily has sent shockwaves through social media after revealing that a young child in Beijing suffered from relentless coughing and severe diarrhoea—symptoms ultimately traced back to his daily-use straw cup. Despite being rinsed every day, the straw’s interior was found coated in black mould.
Three Reasons Your Straw Cup Is a Bacterial Haven
Dr. Zhao Lei, deputy director of the Department of Infectious Diseases at Union Hospital affiliated with Huazhong University of Science and Technology, explains that straw cups harbour hidden contamination zones far beyond what most users imagine. Even when filled only with plain water, three conditions transform these bottles into microbial incubators:
Complex structure and hidden crevices: Straws are narrow, feature tight bends, and often incorporate bite valves, silicone sealing rings, and weighted balls. These precision components create numerous inaccessible corners where moisture and residue accumulate.
Persistent dampness: The interior of a straw remains wet for extended periods, rarely drying completely. During Hong Kong’s humid summer months, this warm, moist environment becomes the perfect nursery for rapid bacterial and fungal growth.
Saliva backflow creates biofilm: Every time you drink,