1. Severe Acute Respiratory Syndrome (SARS). Available online: https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndrome. Accessed on 10 Mar 2020
2. SWINE FLU. Available online: https://en.wikipedia.org/wiki/2009_flu_pandemic_by_country. Accessed on 10 Mar 2020
3. Ebola. Available online: https://en.wikipedia.org/wiki/Western_African_Ebola_virus_epidemic. Accessed on 10 Mar 2020
4. Middle East respiratory syndrome (MARS). Available online: https://en.wikipedia.org/wiki/Middle_East_respiratory_syndrome. Accessed on 10 Mar 2020
5. Novel Coronavirus(COVID-19). Available online: https://www.who.int/emergencies/diseases/novel-coronavirus-2019. Accessed on 10 Mar 2020 to 24 Mar 2020