Sir: Sir: The open vegetable markets all over Pakistan are becoming a hub of many diseases. The greengrocers do not keep up with the required hygienic standards. Different types of mosquitoes and flies sit on the fruits and vegetables, spreading many preventable diseases. Besides the carelessness of sellers, many people use these vegetables without washing them. This negligence on the part of consumers results in the spread of many diseases. Therefore, the food authorities should take measures against the greengrocers violating the hygienic standards as well as inform the masses about the diseases spread due to their negligence. SAMEENA SHAY IBRAHIM Turbat