Viral meningitis: Meningitis caused by many viruses is usually contagious. However, certain viruses that are transmitted by mosquitoes are usually not spread person to person, so they are not contagious.
3] Heat transfers through the glass by conduction 4] Heat transfers from the glass to the outside air via convection. If the temperature differences are small and there are no winds or drafts, transfer of heat to/from air/glass will be by conduction.
When the warm air comes in contact with the cold glasses it transfers some heat energy to the glass and results in formation of a thin foggy layer it. When the glasses also get heated up then the thin layer on the glasses will evaporate clearing the vision through the glass. The fog disappears due to the warming up of glasses. The effect of the humidity in the room on the very cool eye glasses brought into the room can be studied by an experiment. If the air inside the room is warm and generates more water vapor, the vapor pressure of the inside air becomes higher.