Carrier of typhoid, who spread disease for several years was :-

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the name of the carrier of typhoid who spread the disease for several years.

2. **Recall Historical Context**: There is a well-known historical figure associated with being a carrier of typhoid fever.

3. **Name the Individual**: The individual who is famously known as a carrier of typhoid is Mary Mallon.

4. **Understand the Role of the Carrier**: Mary Mallon, also known as "Typhoid Mary," was a healthy carrier of the typhoid fever bacterium, Salmonella typhi.

5. **Explain the Mechanism of Spread**: As a carrier, she did not show symptoms of the disease but was able to excrete the bacteria through her urine and feces. This led to the contamination of food and water, facilitating the spread of typhoid fever to others.

6. **Conclude with the Answer**: Therefore, the answer to the question is Mary Mallon, commonly referred to as "Typhoid Mary."