inclusion criteria: * cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: * mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia * moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals ≥ 5 years of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) \<90% on room air or respiratory rate \> 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: 1. clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or 2. radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound

inclusion criteria: * cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: * mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia * moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals ≥ 5 years of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) \<90% on room air or respiratory rate \> 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: 1. clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or 2. radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound

inclusion criteria: cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals ≥ 5 years of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) <90% on room air or respiratory rate > 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound

inclusion criteria: cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals ≥ 5 years of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) <90% on room air or respiratory rate > 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound

inclusion criteria: - cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: - mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia - moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals > 5 year of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) <90% on room air or respiratory rate > 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: 1. clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or 2. radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound

inclusion criteria: - cohort 1: index case - individuals ≥ 5 years of age with confirmed covid19 mild disease or moderate pneumonia defined as: - mild disease - influenza like illness, with any of the following symptoms cough, fever, headache, sore throat, nasal congestion/runny nose, body pains (myalgia), fatigue (malaise), diarrhoea, abdominal pain, anorexia, nausea or vomiting without evidence of pneumonia or hypoxia - moderate pneumonia -clinical signs of pneumonia (fever, cough, dyspnoea, fast breathing) with no need for supplemental oxygen (oxygen saturation ≥90%% on room air or rr between 20 and 30bpm). household contacts - individuals > 5 year of age living in the same household with the index cases from cohort 1 will be offered to participate into the study. living in the same household is defined as those individuals who are planning to sleep in and eat from same 'cooking pot' during the following 2 weeks. cohort 2: individuals ≥12 years of age with suspected or confirmed covid-19 associated severe pneumonia defined as signs of pneumonia (fever, cough, dyspnoea or fast breathing) plus one of: oxygen saturation (spo2) <90% on room air or respiratory rate > 30 breaths/minute suspected covid-19 disease is defined as clinically or radiologically suspected as determined by the most senior clinician available: 1. clinically suspected signs and symptoms of pneumonia (as defined above) and patient living in or recent travel to region with community transmission or close contact with known covid-19 patient and no alternative diagnosis to explain the clinical picture or 2. radiologically suspected typical radiological signs of covid-19 on chest x-ray or lung ultrasound