NEGATIVE TEST= 0-70% reliable
False negatives are possible and common. We cannot use a negative test to say you are not infected.
If you are SICK. STAY home.
What is CLOSE CONTACT with a POSITIVE person:
Being face-to-face (<1m)
Being in a small room or car/taxi or 15min Living in the same house or sharing the same kitchen and utensils, kissing, touching, holding hands or hugging someone coughing on you.