The anti-virus maker’s research arm, PandaLabs, found that between January and March of this year, more than 6.5 million new malware strains were built, with trojans comprising 75 percent of those. In total, trojans were responsible for 80 percent of global computer infections – a record – far outpacing worms, viruses and adware. Across the globe, researchers discovered that more than 31 percent of PCs have been seeded with malware, with machines in China experiencing the highest infection rates (around 50 percent). In the United States, PandaLabs said 28 percent of computers are infected nationwide, numbers that roughly correspond to previous versions of the report.