<prompt> Cyclodevelopmental type of transmission is seen in-MalariaFilariaPlagueCholera  <response>: Ans. is b i.e., Filaria o Transmission by vectors may be of following types :A Mechanical transmission The infectious agent is mechanically transported by vector, e.g., through souling of feet of flying arthropod. There is no development or multiplication of infectious agent within the vector.B Biological transmission The infectious agent undergoes replication change in number or development change in form or both in vector. So, inectious agent requires an incubation period extrinsic incubation period before vector can transmit it to host. This type of transmission is of three types : -i Propagativeo Agent undergoes multiplication increase in number, but there is no development no change in the form, for example plague bacilli in rat flea.ii Cyclo-developmentalo Agent undergoes only development change in form but there is no multiplication no change in number, for example microfilaria in mosquito.iii Cyclo-propagativeo There is both development change in form and multiplication change in number, for example malarial parasite plasmodium in mosquito. 