It is not transmitted by mosquitos. It is a blood borne pathogen excreted through the saliva of a deer tick. It is not viral or bacteria but a spirocehete which is treatable with antibiotics. The tick needs to be embedded for 24-48 hours for transmission to occur. If you catch it in the first week a single dose of amoxicillin or doxycycline will eradicate the pathogen. If not it may require a regimen of IV antibiotics over several weeks.