Four coastal waters are still positive for paralytic shellfish poison, popularly known as red tide, which produces potent toxins that can cause a variety of gastrointestinal and neurological illnesses. Residents should temporarily avoid selling and consuming shellfish from the coastal areas of Puerto Princesa, Western Samar, and Masbate due to red tide.

Miraflor, M. B. (2017, July 22). Red tide plagues four coastal waters in PH. Manila Bulletin, p. 6.