Quick Answer
Boiling water removes bacteria, parasites, and most viruses, but it may not eliminate all viral pathogens, including norovirus and rotavirus, which can survive for short periods at high temperatures.
Boiling Temperature and Time
Boiling water at a rolling boil (212°F/100°C at sea level) for 1-3 minutes is sufficient to kill most bacteria, parasites, and viruses. However, the effectiveness of boiling against specific pathogens varies. For example, norovirus requires a boiling time of 5-10 minutes to be inactivated, while rotavirus can survive for up to 1 minute at 212°F (100°C).
Viral Pathogens and Boiling
Some viruses, like norovirus and rotavirus, have a higher thermal resistance than others, such as poliovirus and influenza virus. These more heat-sensitive viruses can be inactivated in a matter of seconds to minutes at temperatures above 140°F (60°C). However, the temperature and duration of boiling needed to inactivate these viruses can vary depending on the specific strain and environmental conditions.
Alternative Methods for Viral Inactivation
In situations where boiling is not feasible or sufficient, alternative methods can be employed to inactivate viruses. These include using UV light, chlorine disinfection, or filtration through a 0.2-micron membrane filter. Additionally, heat treatment at temperatures below boiling point (e.g., 160°F/71°C for 30 minutes) can also be effective against some viruses, although the specific conditions required will depend on the pathogen in question.
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