Why do microbiologists wear laboratory coats? did you confirm that this is necessary? 2. why is it necessary to wear clean, protective clothing when caring for a patient? 3. why should hair be kept clean and out of the way when caring for patients? 4. how can the number of microorganisms in the environment be controlled? 5. when and why is hand washing important in patient care? 6. how can those who care for patients avoid spreading microorganisms among them?