Anywhere from 3000 to 47,000.
2 people
about 5 million each year many people get infected
About 3000 people in the United States are affected each year.
I don't think it would be possible to find any real statistics of flu infections in 1818, but I am thinking you meant 1918, a year that there really was a flu pandemic. In 1918, an estimated amount of 500 million people worldwide were infected and 50-100 million of them were killed.
700,000
It is difficult to provide an exact number of people infected with viruses globally each year as it varies depending on the type of virus and region. However, millions of people worldwide are affected by viral infections annually.
There were over 1.2 million cases of chlamydia reported in the US in 2009. Since many people are infected without knowing, it's likely that even more were infected that year.
In the US, approximately 36,000 die of seasonal flu each year. Mostly the aged and infirm or the very young infants.
Zero
Between 10,000 and 15,000 GAS infections occur in the United States every year.
33.2 million(the most approximate estimate as of now)
one or two there have been 17 ever infected in usa