First Wave (1 май 1917 г. – 1 май 1918 г.)
Описание:
A new form of the disease was developed with evidence that the mild first wave had originated in North America.Influenza was present in many countries at this stage, particularly in the northern hemisphere.
Добавлено на ленту времени:
Дата:
1 май 1917 г.
1 май 1918 г.
~ 12 months