Since January, several studies were released, most of them placing Covid-19’s r0 at around 2.5. That implies that during the time of infection a normal person who is diagnosed with the disease can spread it to 2.5-two or three-other individuals.   It’s generally good news for physicists when someone exposed to the disease has transmitted it to less people than the r0 but the larger aim is to get the amount below one.

If orders of social isolation are followed consistently by the society , the disease stops spreading, and when they recover, the average person who was affected does not pass on the infection to someone else. There are four factors that go into the r0 which can be remembered by the word DOTS, meaning Duration, Opportunity, Transmission and Susceptibility. Nothing can really be done to the COVID-19 duration dimension and then again we are all susceptible to it . So that gives us the chance to reduce the scores of opportunity and transmission.

To reduce the value of opportunity is not difficult as  by practicing social isolation or distancing there are less chances of being in contact with an infected person and seeing fewer of them, means the infection has less chance of spreading to other citizens. That goes for transmission as well. Make sure there is a distance of at least two metres, one coughs into their elbow. Often washing and cleaning the hands reduces the likelihood of carrying the virus during the next encounter.

The importance of these habits was emphasized by the HSE’s clinical director Colm Henry who said that these behaviours “will help to save many lives”. It might feel like one is doing literally nothing, but as far the maths and science works, staying at home means helping to bring down the r-nought to less than one which is crucial to put a leash on this pandemic.