The pathogen of bubonic plague is transmitted through the bite of

Which of the following is a characteristics of antibodies?

The rejection of organ transplanting in human is prevented by using

Person $^{\prime}A^{\prime}$ cannot step out of his house. He has to spend his entire life in sterile isolation otherwise, he would quickly contract a fatal infection. This person has almost no effective immune system. This disease is also called as baby in a bubble syndrome. Identify the disease, this person $^{\prime} A ^{\prime}$ is suffering from

‘Syphilis' is a sexually transmitted disease caused by