The causative agent of mosaic disease in potato is virus. It is specifically caused by the potato virus Y, which leads to symptoms such as mottled leaves, stunted growth, and reduced yield in potato plants.
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Foot and mouth disease in animals is caused by a virus. It is a highly contagious viral infection that affects cloven-hoofed animals such as cattle, pigs, sheep, and goats.
Smallpox is caused by a virus. The smallpox virus, known as variola, was responsible for severe illness and high mortality rates. Thanks to global vaccination efforts, smallpox has been eradicated worldwide.
Measles is caused by a virus. The measles virus is highly contagious and spreads through respiratory droplets when an infected person coughs or sneezes. It can lead to serious complications such as pneumonia and encephalitis.
SARS is a viral disease. It stands for Severe Acute Respiratory Syndrome and is caused by the SARS coronavirus (SARS-CoV). It leads to severe respiratory illness with symptoms such as fever, cough, and difficulty breathing.