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Typhoid spreads primarily through food and water contaminated with Salmonella Typhi, the bacteria responsible for the illness. Travelers often face higher risks in areas with poor sanitation. Street food, as you mentioned, often poses a risk because of potential contamination, especially if local hygiene practices are suboptimal. The bacteria can enter the digestive tract whenever contaminated water or food is ingested. Hand hygiene is significant in prevention as it’s possible to contract typhoid if hands become contaminated with these bacteria and then touch the mouth. It’s rarer, but possible, to catch it through contaminated items like utensils or plates, if they haven’t been properly cleaned. In household settings, the risk can be minimized by ensuring thorough handwashing with soap, especially before eating or preparing food, and after using the restroom. Drinking water should be boiled or treated, and fruits and vegetables should be washed with clean water. If someone else in the family develops symptoms like high fever, stomach pain, headache, or fatigue, it is essential for them to seek medical attention promptly. Although person-to-person transmission is not as common, it’s crucial to remain vigilant, especially in shared environments. If your brother’s diagnosis was recent and others shared the same meals, watching for these signs helps catch potential cases early. Lastly, ensure all members are aware of symptoms, practice consistent hygiene, and consider vaccination if traveling to high-risk areas in the future.