What agent causes delayed blisters and dry cough?

The agent that causes delayed blisters and dry cough is Staphylococcal scalded skin syndrome (SSSS), also known as Ritter's disease. It is a rare bacterial skin infection caused by the exfoliative toxins produced by certain strains of Staphylococcus aureus bacteria.

Symptoms of SSSS include:

- Widespread blistering and peeling of the skin, typically starting on the face and spreading to the rest of the body

- Fever

- Irritability

- Lethargy

- Loss of appetite

- Dry cough

SSSS is typically treated with antibiotics and supportive care, such as pain medication and fluids. In severe cases, hospitalization may be necessary.