| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Profliaxis of SARS-CoV-2 infection | 
 
| Profilassi dell’infezione da SARS-CoV-2 | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Prevention of the infection from Coronavirus | 
 
| Prevenzione dell'infezione da Coronavirus | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Virus Diseases [C02] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 23.0 | 
 
| E.1.2 | Level  | LLT | 
 
| E.1.2 | Classification code  | 10053983 | 
 
| E.1.2 | Term  | Corona virus infection | 
 
| E.1.2 | System Organ Class  | 100000004862 | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
To determine if chloroquine or hydroxychloroquine prophylaxis prevents symptomatic COVID-19 infection in health care workers or other groups at high risk. To determine if chloroquine or hydroxychloroquine prophylaxis attenuates COVID-19 infections. | 
 
•	Determinare se la profilassi con clorochina o idrossiclorochina previene l'infezione sintomatica da SARS-CoV-2 negli operatori sanitari o in altri gruppi ad alto rischio.  •	Determinare se la profilassi con clorochina o idrossiclorochina attenua le infezioni da SARS-CoV-2. | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
To determine if chloroquine or hydroxychloroquine prophylaxis prevents asymptomatic COVID-19 infection. To determine if chloroquine or hydroxychloroquine prophylaxis prevents all-cause symptomatic acute respiratory illnesses. To characterise genetic and baseline biochemical markers associated with symptomatic COVID-19, respiratory illness and disease severity. | 
 
•	Determinare se la profilassi con clorochina o idrossiclorochina previene l'infezione asintomatica da SARS-CoV-2. •	Determinare se la profilassi con clorochina o idrossiclorochina previene le malattie respiratorie acute sintomatiche per tutte le cause. •	Caratterizzare marcatori genetici e biochimici basali associati a COVID-19 sintomatico, malattia respiratoria e gravità della malattia | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
•	Participant is willing and able to give informed consent for participation in the study and agrees with the study and its conduct •	Agrees not to self-medicate with chloroquine, hydroxychloroquine or other potential antivirals  •	Adults (exact age is dependent on countries) •	Not previously diagnosed with COVID-19  •	Not currently symptomatic with an ARI •	Participant A. works in healthcare facility or other well characterised high-risk environment, OR B. is an inpatient or relative of a patient in a participating hospital and likely exposed to COVID-19 infection or another high-risk group •	Possesses an internet-enabled smartphone (Android or iOS) | 
 
•	Soggetti adulti che lavorano in una struttura sanitaria, senza precedente diagnosi di COVID-19, che accettano di non auto-medicarsi con clorochina, idrossiclorochina o altri potenziali antivirali •	Consenso informato alla partecipazione allo studio  •	Attualmente non sintomatici per ARI •	In possesso di uno smartphone abilitato a Internet (Android o iOS) | 
 
 
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| E.4 | Principal exclusion criteria | 
•	Hypersensitivity reaction to chloroquine, hydroxychloroquine or 4-aminoquinolines •	Contraindication to taking chloroquine as prophylaxis e.g. known epileptic, known creatinine clearance < 10 ml/min   •	Already taking chloroquine, hydroxychloroquine or 4-aminoquinolines •	Taking a concomitant medication described in section 8.5, which cannot be safely stopped •	Known retinal disease •	Inability to be followed up for the trial period •	Known prolonged QT syndrome (however ECG is not required at baseline) | 
 
• Ipersensibilità a clorochina, idrossiclorochina o 4-amminochinoline • Controindicazione all'assunzione di clorochina come profilassi, ad es. epilettico noto, clearance della creatinina nota <10 ml / min • Assunzione in corso di clorochina, idrossiclorochina o 4-amminochinoline • Assunzione di un farmaco concomitante non ammesso (vd. sezione 8.5 del protocollo), che non può essere interrotto in modo sicuro • Malattia retinica nota • Impossibilità ad essere seguiti per la durata dello studio • Sindrome nota del QT lungo (tuttavia non è richiesto l'ECG al basale) | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
The number of symptomatic COVID-19 infections will be compared between the chloroquine and placebo groups. The symptoms severity and duration of COVID-19 illness, in those who become infected during the study will be compared between the two groups using a respiratory severity score. | 
 
•	Numero di infezioni COVID-19 sintomatiche nei gruppi clorochina/idrossiclorochina e placebo. •	Sintomi, gravità e durata di COVID-19, in coloro che vengono infettati durante lo studio, nei due gruppi, usando un punteggio di gravità. | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| During the clinical trial | 
 
| Durante lo svolgimento dello studio | 
 
 
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| E.5.2 | Secondary end point(s) | 
| The number of asymptomatic cases of COVID-19 will be determined by comparing acute and convalescent serology in the two groups.; The number and severity of symptomatic acute respiratory illnesses will be compared in subjects randomised to chloroquine or placebo.; Genetic loci and levels of biochemical components will be correlated with occurrence of and disease severity of COVID-19 or other ARIs. | 
 
| •	Numero di casi COVID-19 asintomatici determinato mediante la sierologia acuta e convalescente nei due gruppi.; •	Numero e gravità delle malattie respiratorie acute sintomatiche nei due gruppi; •	I loci genetici e i livelli dei markers biochimici saranno correlati con la frequenza di COVID-19, ARI e gravità della malattia. | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| During clinical trial; During clinical trial; During clinical trial | 
 
| Durante lo svolgimento dello studio; Durante lo svolgimento dello studio; Durante lo svolgimento dello studio | 
 
 
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| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  Yes  | 
| E.6.3 | Therapy |  No  | 
| E.6.4 | Safety |  No  | 
| E.6.5 | Efficacy |  No  | 
| E.6.6 | Pharmacokinetic |  No  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  No  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  Yes  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 3 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 50 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  Information not present in EudraCT  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Indonesia | 
 
| Kenya | 
 
| Lao People's Democratic Republic | 
 
| Malawi | 
 
| Thailand | 
 
| Uganda | 
 
| Vietnam | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 1 | 
| E.8.9.1 | In the Member State concerned months | 0 | 
| E.8.9.1 | In the Member State concerned days | 0 | 
| E.8.9.2 | In all countries concerned by the trial years | 1 | 
| E.8.9.2 | In all countries concerned by the trial months | 0 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |