Bike rally in US may have led to 260,000 new COVID-19 cases

Nearly 20 percent of the 1.4 million new cases of coronavirus reported between August 2 and September 2 can be traced back to the Sturgis Motorcycle Rally held in South Dakota last month, a new study suggests.

The 80th annual rally, which saw 460,000 motorcycle enthusiasts flock to the small rural town of Sturgis from all over the US, has since been deemed a ‘super-spreading event’ that’s reportedly responsible more than 260,000 cases of COVID-19.

The determination was made by the IZA Institute of Labor Economics, who have also estimated that the public health costs for treating patients whose infections are linked to the event will around $12.2 billion.

This is enough to have paid each of the estimated 462,182 rally attendees $26,553.64 not to attend,’ the research institute clarified. South Dakota Gov. Kristi Noem called the study 'fiction' on Tuesday, criticizing journalists who reported on it, while defending rally attendees.

The 10-day event took place between August 7 and August 14 in the town of Sturgis, which has a native population of just 7,000 people.Photos from the rally showed scores of bikers packed into bars and restaurants without wearing face coverings or adhering to social distancing guidelines.

‘The spread of the virus due to the event was large,’ the authors of the study write, ‘because it hosted people from all over the country. But the severity of the spread was closely tied to the approaches to the pandemic by Sturgis attendees’ home states.

‘In some places, any spread related to people returning from the rally was blunted by strong mitigation measures, like a face-mask mandate or a prohibition against indoor dining.’To gather information for their analysis, researchers used cell phone data to track the number of people who traveled into Sturgis from out of town during the rally and the corresponding rises in COVID-19 cases in Sturgis and in the areas from which they traveled.

According to the South Dakota Department of Transportation, an estimated 462,182 vehicles entered Sturgis over the rally's 10 days - a 7.5 percent decrease in rally attendance from 2019.

Based on the data collected, researchers determined that over 90 percent of the rally’s attendees travelled to Sturgis from out of state.Of those individuals, only around 18.6 percent were from states bordering South Dakota, with some attendees traveling from as far away as Washington state, researchers said.

The majority of those who traveled to Sturgis came from the Midwest and South, it showed - states such as Texas and Arizona that were then in the grips of escalating outbreaks.Between August 2 and September 2, researchers said that the number of COVID-19 cases in Meade County, which is home to Sturgis, increased from between six and seven percent per 1,000 residents.Meanwhile, the number of South Dakotans battling COVID-19 similarly increased from 3.6 to 3.9 per 1,000 residents.The Sturgis Motorcycle Rally represents a situation where many of the “worst-case scenarios” for super-spreading occurred simultaneously,’ the researchers write in summation. ‘The event was prolonged, included individuals packed closely together, involved a large out-of-town population, and had low compliance with recommended infection countermeasures such as the use of masks.’The Sturgis Motorcycle Rally is, to date, the largest event of its kinds to have been held in the US since the outbreak began in March.

According to the South Dakota Department of Health, the state had 15,403 total cases as of September 8, with 346 of those cases reported in Meade County.Though the number of cases in South Dakota is low in comparison to the hundreds of thousands seen in other states, the numbers are deemed relatively high when considering South Dakota's population, which is thought to be just under 885,000.