Paul Gavan (Sinn Fein) | Oireachtas source

Perhaps we will try to tease this out with a real-life example because I am still struggling with this a little. Let us take a meat factory and two workers. The first worker contracts Covid in the community, at home. He goes to work because he is asymptomatic and then, unfortunately, passes it on to a second worker. What are the obligations of the employer in this example? Does it have to report both people to the HSA as having had a workplace illness of Covid, neither or one of the two?