This striking green stamp from Paraguay highlights the global fight against malaria led by the World Health Organization. The design features the malaria-transmitting mosquito Anopheles darlingi centered over the United Nations emblem, symbolizing international cooperation in disease control. A microscope at the side represents scientific research and medical advancement in combating malaria. Issues like this are popular among collectors interested in medical philately, public health themes, and WHO-related stamps. The clean scientific design and strong symbolism make it a notable thematic collectible.