The Himalayan Mountains stopped the Roman and Chinese empires from spreading north.
tuber closuis
To avoid having bacteria spreading around and to avoid spreading diseases
sneezing
Many kinds of insect pests destroy forests by eating the shoots and spreading diseases.
They want to know how the diseases spread, and how to prevent them from spreading
Yes, vaccinations stop people from contracting and spreading diseases.
Yes, they helped sanitation and stopped disease spreading.
Some diseases are reported to officials, such as the CDC, because they might pose a risk to others by spreading.
spreading and having diseases could be prevented through sanitation
they do this by spreading diseases and germs to to things and people
It is believed that diseases spread through the unsanitary citites and the dumping of trash in community rivers