Children, even those that are vaccinated, may develop rotavirus disease more than once. That is because neither natural infection with rotavirus nor rotavirus vaccination provides full immunity (protection) from future infections. Usually a personâs first infection with rotavirus causes the most severe symptoms.
Because molecules move quicker at higher temperature, causing them to collides more. Since they collides more, reaction occurs to be a lot faster to. And that's why things dissolve quicker in hot water than in room temperature water.
It depends on how the solution is hot and how far it is cooled. A liquid's saturation point is defined by the capability of dissolving particular solute at standard temperature and pressure (STP). It can dissolve more when you increase temperature and less when you decrease. Thus, when a hot saturated solution is cooled down to STP and beyond it the solubility of the solvent will decrease and excess solute amount will precipitate and form a solid.