Patients of the cluster have a cough, phlegm, muscle ache, and fatigue

Index case, or the first case, detected on January 29, a document delivery man, 56. He lived in Chula Niwas building on the 12th flood. Seven cases, residents of Chula Niwas building, possibly infected from him. Three of them are security guards, carrying the virus to spread to a security guard training centre.

<picture>
 <source srcset="https://media.nationthailand.com/uploads/images/2021/02/16/150221862_3688278164559531_1140833570822405246_o.jpg?x-image-process=style/md-webp" media="(max-width: 690px)" type="image/webp" />
 <img src="https://media.nationthailand.com/uploads/images/2021/02/16/150221862_3688278164559531_1140833570822405246_o.jpg?x-image-process=style/lg-webp" alt="Chart shows number of patients in Chula cluster, representing in colour with light blue show patients livin on 12th flood of Chula Niwas building, dark blue is patient live in Chula Niwas building, orange is people in a security guard training centre, yellow is patient in a private company, and white is in other sources." class="img-fluid w-100 showcaption-true" style="width: 800px; height: 450px;" width="800" height="450" loading="lazy" />
 </picture>

Five key factors for this cluster to spread widely includes; living in the same risk area, being co-workers working in the same area, eating together, joins the same activities in large number, and finger scanner which found a number of virus, meaning they didn’t clean the most shared touchpoint regularly.

Dr Taweesin urges public to keep clean and frequently clean their hand since it might become the virus carrier to their bodies.

Finger scanner is one of key surface for Chula infected cluster

Dr Taweesin Visanuyothin, the spokesperson of the Center for COVID-19 Situation Administration (CCSA), has revealed on Tuesday that the cluster found among resident of Chula Niwas building, Chulalongkorn University, has increased to 22 cases --- 14 men and eight women.