Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens. https://pubmed.ncbi.nlm.nih.gov/11570281/
Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens. https://pubmed.ncbi.nlm.nih.gov/11570281/
Did you read the article (in French) linked to the abstract? Neither Iwanowski nor Beijerinck "isolated" any viruses. Instead they damaged plants, and sprayed them with various soup-blends of material. In regards to plants, they claimed that "virus" was present AFTER noting that the leaves of plants were mottled. At present, we would attribute such to issues of water and or sunlight. Regardless, they never showed how said virus would "jump" from an infected to an uninfected plant. And what would be the source of Tobacco Mosaic Virus (TMV)? Would it be exogenous or endogenous? If the latter, how could it be proof of germ theory?
In conclusion, neither Iwanowski nor Beijerinck demonstrated any "natural" transfer of some invisible, pathogenic agent. And no one has since, replicated the "experiments" of either, and demonstrated the existence of TMV.
Maybe you are being sincere, but in the future, please show us the FULL paper, where we can read a methods section.
Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens. https://pubmed.ncbi.nlm.nih.gov/11570281/
Dear Todd Harvey,
Did you read the article (in French) linked to the abstract? Neither Iwanowski nor Beijerinck "isolated" any viruses. Instead they damaged plants, and sprayed them with various soup-blends of material. In regards to plants, they claimed that "virus" was present AFTER noting that the leaves of plants were mottled. At present, we would attribute such to issues of water and or sunlight. Regardless, they never showed how said virus would "jump" from an infected to an uninfected plant. And what would be the source of Tobacco Mosaic Virus (TMV)? Would it be exogenous or endogenous? If the latter, how could it be proof of germ theory?
In conclusion, neither Iwanowski nor Beijerinck demonstrated any "natural" transfer of some invisible, pathogenic agent. And no one has since, replicated the "experiments" of either, and demonstrated the existence of TMV.
Maybe you are being sincere, but in the future, please show us the FULL paper, where we can read a methods section.
Thanks