What should you know about blue cholera?

People may use blue cholera to describe a severe-looking illness, a colour change caused by dehydration, or a term heard in conversation. Clinicians instead assess suspected cholera and its effects. The illness can produce profuse watery diarrhoea and vomiting, causing the body to lose water and salts. Severe dehydration may lead to intense thirst, dry mouth, little urine, dizziness, sunken eyes, weakness, or confusion. Colour change around the lips or skin is an emergency sign rather than a label for a separate type of cholera.

Begin oral rehydration solution as soon as possible if the person is awake and able to drink, using it as directed on the product. Give frequent small sips and continue suitable food when tolerated. Avoid relying on very sugary drinks alone, and do not delay assessment if diarrhoea is heavy or persistent. Use safe water, wash hands carefully, and tell the clinician about recent travel, unsafe water, or contact with someone who has diarrhoea. A healthcare team may provide IV fluid therapy when drinking is not enough.

Seek urgent medical care for signs of dehydration, repeated vomiting, inability to drink, very little urine, fainting, confusion, severe weakness, blood in stool, or a child or older adult becoming unusually sleepy. Emergency help is needed for blue or grey lips, collapse, or difficulty staying awake. Keep giving small sips if safe while arranging help and separate towels and utensils until medical advice is available.

Ask whether testing is needed, which rehydration product and amount are suitable, and whether IV fluids are required. Clarify how to protect household members and which changes mean the person should return immediately.