"a recent upsurge" is correct and usable in written English.
You can use it to refer to an increase in activity or occurrence after a period of inactivity. For example: "There has been a recent upsurge in the number of people attending our weekly meetings."
Julie is not the only Adenuga who has experienced a recent upsurge of global success.
Authorities have been particularly concerned by a recent upsurge in violence in the region.
A recent upsurge in interest in "nones" suggests a new outbreak of surveyitis.
ASIDE from a recent upsurge of cases of foot-and-mouth disease (FMD) in Yorkshire, the plague is receding.
However, a recent upsurge in violence by the government's security forces, frequently aimed at women and children, has put Russia on the spot to offer alternatives.
And Los Angeles does not appear to be alone in grappling with a recent upsurge in graffiti, which is turning up in some unlikely places.
To the Editor: Until recently, the general consensus has been that dogs are poorly susceptible to natural infection with influenza A viruses; however, since the recent upsurge of influenza A circulating subtypes H5N1 and H1N1 viruses, cases of natural infection in dogs have apparently increased.
In addition, the completion of energy projects in Uganda's neighboring countries, such as Kenya's Olkaria-Lessos-Kisumu Transmission Lines, may lead a decline in the recent upsurge in Uganda's electricity exports to Kenya (Figure 12 in Appendix).
It is with great concern that we witness the deteriorating humanitarian situation in various parts of Mindanao as a result of the recent upsurge in conflict.
The Rev. Kevin Irwin, a professor of theology at the Catholic University of America who has written extensively on fasting, said the recent upsurge is a healthy development, healthier than a trendier type of fasting that he has little patience for.
Before the ceasefire, it claimed some 320 lives every month; after the signing, the rate had declined to about 15 a month until the recent upsurge.
