Hunting giant viruses: Scientists have identified the first ever giant amoeba-targeting virus in Finland, suggesting a wider range for these harmless and unusually large viruses.

Viruses are everywhere. Some viruses can cause illness in humans, which has led to people often viewing them as threats. But most viruses are harmless to humans. Many viruses target microbes instead of humans. These viruses likely play essential roles in maintaining a healthy balance in ecosystems by preventing overpopulation of their target microbes. Yet, scientists know very little about most viruses and their role in ecosystems.