At least once a day, local government officials check the temperature of these patients by phone or smartphone application, and also check the status of their breathing and if they have symptoms including a cough, general malaise, nausea or diarrhea. Symptoms to watch out for as signs of a worsening situation include purple lips, increased breathing rate, sudden difficulty breathing, chest pains, an inability to breathe without sitting down, clouding of consciousness, and an abnormal pulse. If the patients themselves or those living with them, such as family members, notice any of these signs, they should immediately contact their local government office. Coronavirus patients sometimes do not feel like they are suffocating even when their blood oxygen levels drop as symptoms progress. For this reason, the central government will improve the distribution of pulse oximeters, which measure oxygen saturation levels. Infectious disease experts call for caution when there is a sudden drop in blood oxygen levels, such as when they fall below 95% in home care patients.