The true figure is hard to know because so many cases go undiagnosed or unreported. But what is certain is that cases are on the increase.
In the UK, it was previously thought there were between two and three thousand new cases annually, but the true figure is now thought to be in the range of eight to ten thousand, with Scotland accounting for more than a quarter of all cases. The incidence in many European countries is even higher than the UK, and the estimated incidence in the USA is around 500,000 cases per year.
You can catch Lyme disease at any time of year, although this is most common in spring and summer.