If the test kit only clearly shows the control line, this may mean that you are negative or that the viral load is too low to be detected. If you experience symptoms (headache, fever, migraine, loss of sense of smell or taste, etc.), please consult your primary care physician, or the nearest health care facility as recommended by your local authorities. If you are not sure, you can repeat the test. Even with a negative result, continue to adhere to social distancing rules, contact restrictions, and hygiene measures.