Thank you again for your supportive review to improve the manuscript.
The contribution is a proposition of services such as screening people with thermal cameras and tracking infected people through CCTV. However, it misses a critical point of COVID. Infected people are in the public space without knowing that they have COVID, since contagion happens before symptoms appears. Once infected people have been identified, they are supposedly in quarantine. Do the authors propose to track everyone and then go back to the records of infected people to retrieve their paths and contacts? Or do the authors want to check if infected people are outside their home instead of in quarantine? This is not clear to me. Also, and more importantly, the integration and flexibility aspects are not really addressed in the end. The authors do not explain how the services they propose could be integrated with existing ones (e.g. which standards should be used) and how the services can be added or removed. This part is only represented as clouds in the proposed structure model but not discussed further. Therefore, it seems that the contribution breaks down to proposing strict tracking services which feasibility and acceptance by the population is not assessed.