Meritnation experts plz explain me this whole paragraph i cannot understand at all

Dear student,
$$\begin{gathered} Indirect transmission: When the transmission of pathogen to a healthy \\ person occurs through an intermediate resorvoir it is known as indirect transmission. \\ It includes: \\ a) Vector borne disease: It mainly occurs through mosquitoes , housefly and \\ other arthropod species. \\ Eg:Malaria is caused by anopheles mosquito , dengue by aedes mosquito etc.. \\ b) Vehicle borne disease: Pathogens of cholera , typhoid etc are transmitted by \\ contaminated food , water etc.. \\ These pathogenic agents are excreted through the feces and contaminate the \\ water sources , thus leading to spread of infections. \\ AIDS is spread by blood \left(or\right) semen of infected individuals respectively. \end{gathered}$$


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