The graph shows the number of cases of Swine Flu (a viral respiratory illness) from May to July 2009 in Australia - HSC - SSCE Biology - Question 15 - 2020 - Paper 1

To effectively limit the spread of Swine Flu in Australia between May and July, several control measures could have been implemented. In the May to June period, it would be crucial to:

1. Quarantine all people arriving in Australia: Implementing a quarantine for international travelers would help to prevent the introduction of new cases from abroad, particularly since there is a significant distinction between locally acquired cases and those from new arrivals.

2. Encourage people to wear masks and wash hands regularly: As community transmission escalates, promoting the use of face masks and hand hygiene can significantly reduce the likelihood of viral spread among the population.

3. Isolate people with symptoms: Prompt isolation of symptomatic individuals would help to prevent further transmission of the virus within communities.

In the July period, reinforcing these measures would still be vital:

1. Encourage people to wear masks and wash hands regularly: As the number of cases rises, maintaining public awareness about mask-wearing and hygiene practices becomes essential.

2. Isolate people with symptoms: Continued isolation practices for symptomatic individuals can help in limiting outbreaks.

Overall, the combination of these control measures would be effective in managing the spread of Swine Flu during this critical period.