Coronavirus claimed its seventh fatality in Senegal on Friday, as health officials recorded the West African state's largest single increase in infections and warned that traders are particularly at risk. In a statement on Friday, the health ministry announced that a 65-year-old man had succumbed to COVID-19 in the seaside capital Dakar. Senegalese authorities said the same day that they had recorded 66 new coronavirus cases -- out of a total of 545 -- in the largest single increase since the pandemic began in the country. Coronavirus had appeared relatively contained in Senegal until recently. There are fears that as with other poor countries in the region, the nation of some 16 million people is ill-equipped to handle a large outbreak. Senegalese health authorities are also increasingly concerned about a rise in cases that cannot be immediately traced to known infections -- an indicator that the outbreak may be bigger than detected. Five of the 66 new infections announced on Friday were such cases, which are also known as community-transmission cases, the health ministry said. It added that four of these cases had been detected in market traders and warned that this group was particularly at risk of infection. Senegal's Health Minister Abdoulaye Diouf Sarr told reporters on Friday that the news underlined why the government has ordered the "systematic wearing of masks in markets and other public places." He added that he had instructed his staff to ramp up testing in the country. In addition to the night-time curfew, Senegal has closed schools, banned travel between cities and required people to wear a mask in public transport and shops. It has not implemented a lockdown, however, which would present a major challenge in a poor country where many informal workers live day-to-day. siu-eml/ach