Can someone get infected by not realising?

Yes, it is possible for someone to get infected without realizing it, as many infections can be asymptomatic or have mild symptoms that go unnoticed. This is particularly common with certain viral infections, like COVID-19 or HIV, where individuals may carry the virus without exhibiting clear signs of illness. Additionally, some people may mistake mild symptoms for something less serious, leading them to overlook an infection. Regular health check-ups and awareness of symptoms are important for early detection.