The around 3,000 residents of Periana, especially those in the village centre, are concerned following an "alarming" increase in gastroenteritis cases, with symptoms of fever, vomiting, diarrhoea and dizziness.
Although most of them are mild cases lasting 24 to 72 hours, both the town council and the Junta de Andalucía have decided to take action.
The region’s Ministry of Health has declared it as an 'outbreak' due to the number of cases - more than 80 - as it tries to determine the possible cause and act on it.
Although the number of new cases has decreased drastically, it has not been ruled out that some more may appear due to secondary infections, with the suspicion the “gastroenteritis is of viral origin", the ministry added.
Health experts say residents “are advised not to consume water from sources not connected to the public network or whose origin is not known”.
Chlorine levels in the public network supply have been restored after some deficiencies were detected during analysis.
The town's mayor, Rafael Torrubia, told SUR that he has had knowledge of several cases in the municipality, "where people are not connected to the mains network, but have their own water sources". He added: "We have analysed the town's water and the levels are correct, but we are still waiting for lab results."
“There have also been some cases in other nearby municipalities, and we do not know if they have a connection with ours, because it may be a gastroenteritis outbreak of viral origin that is transmitted from person to person, or bacteria," said Torrubia.