Hepatitis B virus (HBV) is a pathogen that affects the liver. Table 1 shows information about new cases of Hepatitis B diagnosed in a region over several years.
| Year | Number of new Hepatitis B cases in women | Number of new Hepatitis B cases in men |
|---|---|---|
| 2013 | 412 | 1850 |
| 2015 | 435 | 1920 |
| 2017 | 395 | 1710 |
| 2019 | 320 | 1480 |
| 2021 | 215 | 1085 |
State one way the Hepatitis B virus can be transmitted from one person to another.
Describe the trends shown in Table 1 for new cases of Hepatitis B in both women and men between 2013 and 2021.
Calculate the ratio of new cases of Hepatitis B in women to new cases of Hepatitis B in men in 2021. Give your answer to 3 significant figures in the form N:1N : 1N:1.