How many nucleic acids does a short message with overlapping tracks need?

Guangzhou CDC issued an urgent reminder to the public:

First of all, if you are still traveling or traveling in Shaanxi, Gansu, Ningxia and Mongolia, please complete the nucleic acid test there as soon as possible.

Two, Shaanxi, Gansu, Ningxia and Mongolia to (return to) Guangzhou, please complete a free nucleic acid test at the railway station or airport. Personnel from other provinces (returning to Guangzhou) complete a nucleic acid test within 12 hours after returning to the community.

3. Those who have come (returned) to Guangzhou, and all the "red code" or "yellow code" people who have lived in the following areas, please take the initiative to report to their communities (villages), units and hotels as soon as possible.

The new cases involved areas: Wuwei City in Gansu Province, zhongwei City in Ningxia, wuzhong City in Ningxia and Xingtai City in Hebei Province 18 since June.

The fourth is to ask the general public and tourists to pay attention to the trajectory of new cases published by major news media and official websites, and those who have time and space intersection with published cases should report as soon as possible.

Five, the general public and tourists should strengthen self-protection, adhere to the code scanning, temperature measurement, wearing masks and other normalized prevention and control measures, wash their hands frequently, more ventilation, do not gather, keep social distance, and actively cooperate with the government to implement various epidemic prevention measures.

Six, advocate the National Day holiday from other provinces (to Guangzhou) personnel to take the initiative to do a nucleic acid test within 48 hours, and self-observation 14 days, do a good job in health monitoring.

Once you have symptoms such as fever, dry cough, fatigue, decreased sense of smell and taste, stuffy nose, runny nose, sore throat, conjunctivitis, myalgia and diarrhea, you should immediately report to your neighborhood Committee, unit or hotel, go to the fever clinic nearby in time, and actively inform the doctor of your travel history. Please take personal protection during the visit and don't take public transportation.