The mother goddess is worshipped in various forms, Sittala, being the small-pox goddess, is worshipped by Sindhis. She is the eldest of several sisters, named after different kinds of diseases such as, measles etc. The worship of the goddess, lasts during the whole period of the attack of the goddess (disease).
The annual festival observed in honour of this goddess is called "Thadri", or the cooling festival. It falls on the 7th day of the waning in the month of Savan (July-August) every year.

Ladies prepare cakes and curd on the previous day of the festival as they do on the last day of the attack of small-pox. They sing, go to the local shrine and the cold meals (thados). On this day, fire is not lit at home. Images of Sittala, prepared from cow-dung,

Are fixed on the outside wall of the house, during the attack of small-pox.