The decline in poliovirus was due to better sanitation and hygiene habits, similar to the decline in diphtheria, typhoid, and tuberculosis.
כללי Water & the Environment
The decline in poliovirus was due to better sanitation and hygiene habits, similar to the decline in diphtheria, typhoid, and tuberculosis.
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מיין לפי
* השאלה נוספה בתאריך: 09-07-2025